diff --git a/CHANGELOG.md b/CHANGELOG.md
index f709b8be..a56e56e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Changed
 - DataSink `branch` is replaced with `putAll` to avoid confusion with DataTree methods
+- Meta delegate now uses a specific class that has a descriptor
 
 ### Deprecated
 
@@ -16,7 +17,8 @@
 ### Fixed
 - `listOfScheme` and `listOfConvertable` delegates provides correct items order.
 - Scheme meta setter works with proper sub-branch.
-- NameToken.parse improper work with indices
+- NameToken.parse improper work with indices.
+- Proper data handling for cache.
 
 
 ### Security
diff --git a/build.gradle.kts b/build.gradle.kts
index b2f7e5e9..78dc6d35 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.8.2"
+    version = "0.8.2-dev-1"
 }
 
 subprojects {
diff --git a/dataforge-context/api/dataforge-context.api b/dataforge-context/api/dataforge-context.api
index 12bca176..eb94f89d 100644
--- a/dataforge-context/api/dataforge-context.api
+++ b/dataforge-context/api/dataforge-context.api
@@ -265,8 +265,6 @@ public abstract interface annotation class space/kscience/dataforge/descriptors/
 }
 
 public final class space/kscience/dataforge/descriptors/ReflectiveDescriptorsKt {
-	public static final fun forClass (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;Lkotlin/reflect/KClass;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public static synthetic fun forClass$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;Lkotlin/reflect/KClass;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 }
 
 public final class space/kscience/dataforge/properties/MetaAsFlowKt {
diff --git a/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt b/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt
index 1f2db7fc..9c36410a 100644
--- a/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt
+++ b/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt
@@ -10,11 +10,11 @@ import space.kscience.dataforge.meta.ValueType
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
 import space.kscience.dataforge.meta.descriptors.node
+import space.kscience.dataforge.misc.DFExperimental
 import java.net.URL
 import kotlin.reflect.KClass
 import kotlin.reflect.full.isSubclassOf
 import kotlin.reflect.full.memberProperties
-import kotlin.reflect.typeOf
 
 
 /**
@@ -58,9 +58,9 @@ private fun MetaDescriptorBuilder.loadDescriptorFromResource(resource: Descripto
     }
 }
 
-
-public fun <T : Any> MetaDescriptor.Companion.forClass(
-    kClass: KClass<T>,
+@DFExperimental
+public fun MetaDescriptor.Companion.forClass(
+    kClass: KClass<out Any>,
     mod: MetaDescriptorBuilder.() -> Unit = {},
 ): MetaDescriptor = MetaDescriptor {
     when {
@@ -79,7 +79,7 @@ public fun <T : Any> MetaDescriptor.Companion.forClass(
             is DescriptorUrl -> loadDescriptorFromUrl(URL(it.url))
         }
     }
-    kClass.memberProperties.forEach { property ->
+    kClass.memberProperties.forEach { property->
 
         var flag = false
 
@@ -88,6 +88,12 @@ public fun <T : Any> MetaDescriptor.Companion.forClass(
             (property.returnType.classifier as? KClass<*>)?.let {
                 from(forClass(it))
             }
+//
+//            (property.getDelegate(Unit) as? MetaDelegate<*>)?.descriptor?.let {
+//                from(it)
+//                flag = true
+//            }
+
             property.annotations.forEach {
                 when (it) {
                     is Description -> {
@@ -119,6 +125,6 @@ public fun <T : Any> MetaDescriptor.Companion.forClass(
     mod()
 }
 
-@Suppress("UNCHECKED_CAST")
-public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor( noinline mod: MetaDescriptorBuilder.() -> Unit = {}): MetaDescriptor =
-    MetaDescriptor.forClass(typeOf<T>().classifier as KClass<T>, mod)
\ No newline at end of file
+@DFExperimental
+public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor(noinline mod: MetaDescriptorBuilder.() -> Unit = {}): MetaDescriptor =
+    MetaDescriptor.forClass(T::class, mod)
\ No newline at end of file
diff --git a/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt b/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt
index 617e85cc..df849ce5 100644
--- a/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt
+++ b/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt
@@ -1,3 +1,5 @@
+@file:OptIn(DFExperimental::class)
+
 package space.kscience.dataforge.descriptors
 
 import kotlinx.serialization.encodeToString
@@ -8,8 +10,9 @@ import space.kscience.dataforge.meta.SchemeSpec
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.int
 import space.kscience.dataforge.meta.string
+import space.kscience.dataforge.misc.DFExperimental
 
-private class TestScheme: Scheme(){
+private class TestScheme : Scheme() {
 
     @Description("A")
     val a by string()
@@ -17,15 +20,17 @@ private class TestScheme: Scheme(){
     @Description("B")
     val b by int()
 
-    companion object: SchemeSpec<TestScheme>(::TestScheme){
+    val c by int()
+
+    companion object : SchemeSpec<TestScheme>(::TestScheme) {
         override val descriptor: MetaDescriptor = autoDescriptor()
     }
 }
 
 class TestAutoDescriptors {
     @Test
-    fun autoDescriptor(){
+    fun autoDescriptor() {
         val autoDescriptor = MetaDescriptor.forClass(TestScheme::class)
-        println(Json{prettyPrint = true}.encodeToString(autoDescriptor))
+        println(Json { prettyPrint = true }.encodeToString(autoDescriptor))
     }
 }
\ No newline at end of file
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/MapAction.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/MapAction.kt
index a1ca8e59..08bf08e9 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/MapAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/MapAction.kt
@@ -48,8 +48,8 @@ public class MapActionBuilder<T, R>(
     public inline fun <reified R1 : R> result(noinline f: suspend ActionEnv.(T) -> R1): Unit = result(typeOf<R1>(), f)
 }
 
-@PublishedApi
-internal class MapAction<T, R>(
+@UnsafeKType
+public class MapAction<T, R>(
     outputType: KType,
     private val block: MapActionBuilder<T, R>.() -> Unit,
 ) : AbstractAction<T, R>(outputType) {
@@ -78,7 +78,6 @@ internal class MapAction<T, R>(
         //getting new meta
         val newMeta = builder.meta.seal()
 
-        @OptIn(UnsafeKType::class)
         val newData = Data(builder.outputType, newMeta, dependencies = listOf(data)) {
             builder.result(env, data.await())
         }
@@ -106,6 +105,7 @@ internal class MapAction<T, R>(
  * A one-to-one mapping action
  */
 
+@OptIn(UnsafeKType::class)
 public inline fun <T, reified R> Action.Companion.mapping(
     noinline builder: MapActionBuilder<T, R>.() -> Unit,
 ): Action<T, R> = MapAction(typeOf<R>(), builder)
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataFilter.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataFilter.kt
index bc66e910..38174e50 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataFilter.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataFilter.kt
@@ -61,7 +61,7 @@ internal class FilteredDataTree<T>(
 
     override val data: Data<T>?
         get() = source[branch].takeIf {
-            filter.accepts(Name.EMPTY, data?.meta, data?.type ?: dataType)
+            filter.accepts(Name.EMPTY, it?.meta, it?.type ?: dataType)
         }
 
     override val items: Map<NameToken, DataTree<T>>
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSink.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSink.kt
index 9d860310..6daeae98 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSink.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/DataSink.kt
@@ -2,6 +2,7 @@ package space.kscience.dataforge.data
 
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.mapNotNull
@@ -80,7 +81,8 @@ private class MutableDataTreeRoot<T>(
     override val dataType: KType,
 ) : MutableDataTree<T> {
 
-    override val updates = MutableSharedFlow<DataUpdate<T>>()
+    override val updates = MutableSharedFlow<DataUpdate<T>>(100, onBufferOverflow = BufferOverflow.DROP_LATEST)
+
 
     inner class MutableDataTreeBranch(val branchName: Name) : MutableDataTree<T> {
 
@@ -108,10 +110,10 @@ private class MutableDataTreeRoot<T>(
         override suspend fun update(name: Name, data: Data<T>?) {
             if (name.isEmpty()) {
                 this.data = data
+                this@MutableDataTreeRoot.updates.emit(DataUpdate(data?.type ?: dataType, branchName + name, data))
             } else {
                 getOrCreateItem(name.first()).update(name.cutFirst(), data)
             }
-            this@MutableDataTreeRoot.updates.emit(DataUpdate(data?.type ?: dataType, branchName + name, data))
         }
 
     }
@@ -122,7 +124,7 @@ private class MutableDataTreeRoot<T>(
     override val items = HashMap<NameToken, MutableDataTree<T>>()
 
     override fun getOrCreateItem(token: NameToken): MutableDataTree<T> = items.getOrPut(token) {
-        MutableDataTreeRoot(dataType)
+        MutableDataTreeBranch(token.asName())
     }
 
     override fun set(token: NameToken, data: Data<T>?) {
@@ -133,10 +135,10 @@ private class MutableDataTreeRoot<T>(
     override suspend fun update(name: Name, data: Data<T>?) {
         if (name.isEmpty()) {
             this.data = data
+            updates.emit(DataUpdate(data?.type ?: dataType, name, data))
         } else {
             getOrCreateItem(name.first()).update(name.cutFirst(), data)
         }
-        updates.emit(DataUpdate(data?.type ?: dataType, name, data))
     }
 }
 
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataBuilders.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataBuilders.kt
index 8ec3e361..649cfd19 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataBuilders.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataBuilders.kt
@@ -6,10 +6,7 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
-import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.asName
-import space.kscience.dataforge.names.isEmpty
-import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.names.*
 
 
 public fun <T> DataSink<T>.put(value: NamedData<T>) {
@@ -83,13 +80,13 @@ public inline fun <reified T> DataSink<T>.putValue(
  * Emit static data with the fixed value
  */
 public inline fun <reified T> DataSink<T>.putValue(
-    name: String,
+    name: Name,
     value: T,
     meta: Meta = Meta.EMPTY,
 ): Unit = put(name, Data.wrapValue(value, meta))
 
 public inline fun <reified T> DataSink<T>.putValue(
-    name: Name,
+    name: String,
     value: T,
     meta: Meta = Meta.EMPTY,
 ): Unit = put(name, Data.wrapValue(value, meta))
@@ -100,6 +97,18 @@ public inline fun <reified T> DataSink<T>.putValue(
     metaBuilder: MutableMeta.() -> Unit,
 ): Unit = put(Name.parse(name), Data.wrapValue(value, Meta(metaBuilder)))
 
+public suspend inline fun <reified T> DataSink<T>.updateValue(
+    name: Name,
+    value: T,
+    meta: Meta = Meta.EMPTY,
+): Unit = update(name, Data.wrapValue(value, meta))
+
+public suspend inline fun <reified T> DataSink<T>.updateValue(
+    name: String,
+    value: T,
+    meta: Meta = Meta.EMPTY,
+): Unit = update(name.parseAsName(), Data.wrapValue(value, meta))
+
 public fun <T> DataSink<T>.putAll(sequence: Sequence<NamedData<T>>) {
     sequence.forEach {
         put(it.name, it.data)
@@ -120,6 +129,6 @@ public fun <T : Any> DataSink<T>.putAllAndWatch(
 ): Job {
     putAll(branchName, source)
     return source.updates.onEach {
-        put(branchName + it.name, it.data)
+        update(branchName + it.name, it.data)
     }.launchIn(scope)
 }
\ No newline at end of file
diff --git a/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt b/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt
index ef9b14ab..477ca592 100644
--- a/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt
+++ b/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt
@@ -41,7 +41,7 @@ internal class ActionsTest {
 
 
         repeat(10) {
-            source.putValue(it.toString(), it)
+            source.updateValue(it.toString(), it)
         }
         result.updates.take(10).onEach { println(it.name) }.collect()
 
diff --git a/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/DataTreeBuilderTest.kt b/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/DataTreeBuilderTest.kt
index b5738820..760aeec2 100644
--- a/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/DataTreeBuilderTest.kt
+++ b/dataforge-data/src/commonTest/kotlin/space/kscience/dataforge/data/DataTreeBuilderTest.kt
@@ -1,9 +1,8 @@
 package space.kscience.dataforge.data
 
-import kotlinx.coroutines.cancel
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.take
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.runTest
 import space.kscience.dataforge.names.asName
 import kotlin.test.Test
@@ -15,7 +14,7 @@ internal class DataTreeBuilderTest {
     @Test
     fun testTreeBuild() = runTest(timeout = 500.milliseconds) {
         val node = DataTree<Any> {
-            putAll("primary"){
+            putAll("primary") {
                 putValue("a", "a")
                 putValue("b", "b")
             }
@@ -53,19 +52,22 @@ internal class DataTreeBuilderTest {
 
     @Test
     fun testDynamicUpdates() = runTest(timeout = 500.milliseconds) {
-        launch {
-            val subNode = MutableDataTree<Int>()
+        var job: Job? = null
 
-            val rootNode = MutableDataTree<Int>() {
-                putAllAndWatch(this@launch, "sub".asName(), subNode)
-            }
+        val subNode = MutableDataTree<Int>()
 
-            repeat(10) {
-                subNode.putValue("value[$it]", it)
-            }
-            subNode.updates.take(10).collect()
-            assertEquals(9, rootNode["sub.value[9]"]?.await())
-            cancel()
-        }.join()
+        val rootNode = MutableDataTree<Int>() {
+            job = putAllAndWatch(this@runTest, "sub".asName(), subNode)
+        }
+
+        repeat(10) {
+            subNode.updateValue("value[$it]", it)
+        }
+
+        rootNode.updates.take(10).collect()
+        assertEquals(9, rootNode["sub.value[9]"]?.await())
+        assertEquals(8, rootNode["sub.value[8]"]?.await())
+
+        job?.cancel()
     }
 }
\ No newline at end of file
diff --git a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt
index 0d79da4d..f431a731 100644
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOPlugin.kt
@@ -6,7 +6,7 @@ import space.kscience.dataforge.io.IOFormatFactory.Companion.IO_FORMAT_TYPE
 import space.kscience.dataforge.io.MetaFormatFactory.Companion.META_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.string
-import space.kscience.dataforge.misc.DFInternal
+import space.kscience.dataforge.misc.UnsafeKType
 import space.kscience.dataforge.names.Name
 import kotlin.reflect.KType
 import kotlin.reflect.typeOf
@@ -19,11 +19,11 @@ public class IOPlugin(meta: Meta) : AbstractPlugin(meta) {
     }
 
     @Suppress("UNCHECKED_CAST")
-    @DFInternal
+    @UnsafeKType
     public fun <T> resolveIOFormat(type: KType, meta: Meta): IOFormat<T>? =
         ioFormatFactories.singleOrNull { it.type == type }?.build(context, meta) as? IOFormat<T>
 
-    @OptIn(DFInternal::class)
+    @OptIn(UnsafeKType::class)
     public inline fun <reified T> resolveIOFormat(meta: Meta = Meta.EMPTY): IOFormat<T>? =
         resolveIOFormat(typeOf<T>(), meta)
 
diff --git a/dataforge-meta/api/dataforge-meta.api b/dataforge-meta/api/dataforge-meta.api
index f9834c54..620e64d4 100644
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@@ -1,3 +1,15 @@
+public final class space/kscience/dataforge/meta/ByteArrayValue : java/lang/Iterable, kotlin/jvm/internal/markers/KMappedMarker, space/kscience/dataforge/meta/Value {
+	public fun <init> ([B)V
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getList ()Ljava/util/List;
+	public fun getType ()Lspace/kscience/dataforge/meta/ValueType;
+	public synthetic fun getValue ()Ljava/lang/Object;
+	public fun getValue ()[B
+	public fun hashCode ()I
+	public fun iterator ()Ljava/util/Iterator;
+	public fun toString ()Ljava/lang/String;
+}
+
 public abstract interface class space/kscience/dataforge/meta/Configurable {
 	public abstract fun getMeta ()Lspace/kscience/dataforge/meta/MutableMeta;
 }
@@ -30,7 +42,20 @@ public final class space/kscience/dataforge/meta/EnumValue : space/kscience/data
 }
 
 public final class space/kscience/dataforge/meta/ExoticValuesKt {
+	public static final fun asValue ([B)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue ([D)Lspace/kscience/dataforge/meta/Value;
+	public static final fun byteArray (Lspace/kscience/dataforge/meta/MetaProvider;[BLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun byteArray (Lspace/kscience/dataforge/meta/MutableMetaProvider;[BLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun byteArray$default (Lspace/kscience/dataforge/meta/MetaProvider;[BLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun byteArray$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[BLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun doubleArray (Lspace/kscience/dataforge/meta/MetaProvider;[DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun doubleArray (Lspace/kscience/dataforge/meta/MutableMetaProvider;[DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
+	public static synthetic fun doubleArray$default (Lspace/kscience/dataforge/meta/MetaProvider;[DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun doubleArray$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun getByteArray (Lspace/kscience/dataforge/meta/Meta;)[B
+	public static final fun getByteArray (Lspace/kscience/dataforge/meta/Value;)[B
+	public static final fun getDoubleArray (Lspace/kscience/dataforge/meta/Meta;)[D
+	public static final fun getDoubleArray (Lspace/kscience/dataforge/meta/Value;)[D
 	public static final fun lazyParseValue (Ljava/lang/String;)Lspace/kscience/dataforge/meta/LazyParsedValue;
 }
 
@@ -199,53 +224,56 @@ public final class space/kscience/dataforge/meta/MetaConverterKt {
 	public static final fun convertNullable (Lspace/kscience/dataforge/meta/MetaConverter;Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
 }
 
+public abstract interface class space/kscience/dataforge/meta/MetaDelegate : kotlin/properties/ReadOnlyProperty, space/kscience/dataforge/meta/descriptors/Described {
+}
+
 public final class space/kscience/dataforge/meta/MetaDelegateKt {
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;ZLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;ZLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun double (Lspace/kscience/dataforge/meta/MetaProvider;DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun double (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MetaProvider;DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun float (Lspace/kscience/dataforge/meta/MetaProvider;FLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun float (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MetaProvider;FLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MetaProvider;ZLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MetaProvider;ZLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun double (Lspace/kscience/dataforge/meta/MetaProvider;DLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun double (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MetaProvider;DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun float (Lspace/kscience/dataforge/meta/MetaProvider;FLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun float (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MetaProvider;FLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun value (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadOnlyProperty;
-	public static final fun value (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun value (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun value (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 }
 
 public final class space/kscience/dataforge/meta/MetaKt {
@@ -352,6 +380,7 @@ public abstract interface class space/kscience/dataforge/meta/MutableMeta : spac
 	public fun put (Ljava/lang/String;Lspace/kscience/dataforge/meta/MetaRepr;)V
 	public fun put (Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;)V
 	public fun put (Ljava/lang/String;Z)V
+	public fun put (Ljava/lang/String;[B)V
 	public fun put (Ljava/lang/String;[D)V
 	public fun put (Lspace/kscience/dataforge/names/Name;Ljava/lang/Enum;)V
 	public fun put (Lspace/kscience/dataforge/names/Name;Ljava/lang/Number;)V
@@ -371,63 +400,64 @@ public final class space/kscience/dataforge/meta/MutableMeta$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
+public abstract interface class space/kscience/dataforge/meta/MutableMetaDelegate : kotlin/properties/ReadWriteProperty, space/kscience/dataforge/meta/descriptors/Described {
+}
+
 public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;ZLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ZLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun convertable (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun convertable$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun doubleArray (Lspace/kscience/dataforge/meta/MutableMetaProvider;[DLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun doubleArray$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun float (Lspace/kscience/dataforge/meta/MutableMetaProvider;FLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun float (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;FLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun int (Lspace/kscience/dataforge/meta/MutableMetaProvider;ILspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun int (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun listOfConvertable (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun listOfConvertable$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun listValue (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun listValue$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun long (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun long (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun numberList (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun numberList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun stringList (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun stringList (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun stringList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun stringList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun value (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
-	public static final fun value (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
-	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlin/properties/ReadWriteProperty;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;ZLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun boolean$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ZLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun convertable (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun convertable$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun double (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;DLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun double$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun float (Lspace/kscience/dataforge/meta/MutableMetaProvider;FLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun float (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;FLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun float$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun int (Lspace/kscience/dataforge/meta/MutableMetaProvider;ILspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun int (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun listOfConvertable (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun listOfConvertable$default (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/MetaConverter;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun listValue (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun listValue$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun long (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun long (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun node (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaConverter;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun number (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun numberList (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun numberList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun string (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun string$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun stringList (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun stringList (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun stringList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun stringList$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;[Ljava/lang/String;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun value (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static final fun value (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
+	public static synthetic fun value$default (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMetaDelegate;
 }
 
 public final class space/kscience/dataforge/meta/MutableMetaKt {
@@ -447,6 +477,7 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 	public static final fun getOrCreate (Lspace/kscience/dataforge/meta/MutableTypedMeta;Ljava/lang/String;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
 	public static final fun remove (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;)V
 	public static final fun remove (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)V
+	public static final fun reset (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Ljava/lang/Iterable;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Ljava/lang/Iterable;)V
@@ -703,7 +734,6 @@ public final class space/kscience/dataforge/meta/Value$Companion {
 public final class space/kscience/dataforge/meta/ValueExtensionsKt {
 	public static final fun getBoolean (Lspace/kscience/dataforge/meta/Value;)Z
 	public static final fun getDouble (Lspace/kscience/dataforge/meta/Value;)D
-	public static final fun getDoubleArray (Lspace/kscience/dataforge/meta/Value;)[D
 	public static final fun getFloat (Lspace/kscience/dataforge/meta/Value;)F
 	public static final fun getInt (Lspace/kscience/dataforge/meta/Value;)I
 	public static final fun getLong (Lspace/kscience/dataforge/meta/Value;)J
@@ -722,7 +752,6 @@ public final class space/kscience/dataforge/meta/ValueKt {
 	public static final fun asValue (Ljava/lang/Number;)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue (Ljava/lang/String;)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue (Z)Lspace/kscience/dataforge/meta/Value;
-	public static final fun asValue ([B)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue ([F)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue ([I)Lspace/kscience/dataforge/meta/Value;
 	public static final fun asValue ([J)Lspace/kscience/dataforge/meta/Value;
@@ -928,6 +957,9 @@ public final class space/kscience/dataforge/misc/NamedKt {
 	public static final fun isAnonymous (Lspace/kscience/dataforge/misc/Named;)Z
 }
 
+public abstract interface annotation class space/kscience/dataforge/misc/UnsafeKType : java/lang/annotation/Annotation {
+}
+
 public final class space/kscience/dataforge/names/Name {
 	public static final field Companion Lspace/kscience/dataforge/names/Name$Companion;
 	public static final field NAME_SEPARATOR Ljava/lang/String;
@@ -945,6 +977,16 @@ public final class space/kscience/dataforge/names/Name$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
+public final class space/kscience/dataforge/names/NameIndexComparator : java/util/Comparator {
+	public static final field INSTANCE Lspace/kscience/dataforge/names/NameIndexComparator;
+	public synthetic fun compare (Ljava/lang/Object;Ljava/lang/Object;)I
+	public fun compare (Ljava/lang/String;Ljava/lang/String;)I
+}
+
+public final class space/kscience/dataforge/names/NameIndexComparatorKt {
+	public static final fun getIndexedList (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/Name;)Ljava/util/List;
+}
+
 public final class space/kscience/dataforge/names/NameKt {
 	public static final fun appendFirst (Lspace/kscience/dataforge/names/Name;Ljava/lang/String;)Lspace/kscience/dataforge/names/Name;
 	public static final fun appendLeft (Lspace/kscience/dataforge/names/Name;Ljava/lang/String;)Lspace/kscience/dataforge/names/Name;
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
index a24f7371..8c5a738f 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
@@ -1,15 +1,27 @@
 package space.kscience.dataforge.meta
 
+import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
 
 /* Meta delegates */
 
-public fun MetaProvider.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> = ReadOnlyProperty { _, property ->
-    get(key ?: property.name.asName())
+public interface MetaDelegate<T> : ReadOnlyProperty<Any?, T>, Described
+
+
+public fun MetaProvider.node(
+    key: Name? = null,
+    descriptor: MetaDescriptor? = null,
+): MetaDelegate<Meta?> = object : MetaDelegate<Meta?> {
+    override val descriptor: MetaDescriptor? = descriptor
+
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
+        return get(key ?: property.name.asName())
+    }
 }
 
 /**
@@ -18,8 +30,12 @@ public fun MetaProvider.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> =
 public fun <T> MetaProvider.spec(
     metaSpec: MetaSpec<T>,
     key: Name? = null,
-): ReadOnlyProperty<Any?, T?> = ReadOnlyProperty { _, property ->
-    get(key ?: property.name.asName())?.let { metaSpec.read(it) }
+): MetaDelegate<T?> = object : MetaDelegate<T?> {
+    override val descriptor: MetaDescriptor? get() = metaSpec.descriptor
+
+    override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
+        return get(key ?: property.name.asName())?.let { metaSpec.read(it) }
+    }
 }
 
 /**
@@ -27,9 +43,9 @@ public fun <T> MetaProvider.spec(
  */
 @DFExperimental
 public inline fun <reified T> MetaProvider.serializable(
-    descriptor: MetaDescriptor? = null,
     key: Name? = null,
-): ReadOnlyProperty<Any?, T?> = spec(MetaConverter.serializable(descriptor), key)
+    descriptor: MetaDescriptor? = null,
+): MetaDelegate<T?> = spec(MetaConverter.serializable(descriptor), key)
 
 @Deprecated("Use convertable", ReplaceWith("convertable(converter, key)"))
 public fun <T> MetaProvider.node(
@@ -43,78 +59,90 @@ public fun <T> MetaProvider.node(
 public fun <T> Meta.listOfSpec(
     converter: MetaSpec<T>,
     key: Name? = null,
-): ReadOnlyProperty<Any?, List<T>> = ReadOnlyProperty{_, property ->
-    val name = key ?: property.name.asName()
-    getIndexed(name).values.map { converter.read(it) }
+): MetaDelegate<List<T>> = object : MetaDelegate<List<T>> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {
+        val name = key ?: property.name.asName()
+        return getIndexed(name).values.map { converter.read(it) }
+    }
+
+    override val descriptor: MetaDescriptor? = converter.descriptor?.copy(multiple = true)
 }
 
 @DFExperimental
 public inline fun <reified T> Meta.listOfSerializable(
-    descriptor: MetaDescriptor? = null,
     key: Name? = null,
-): ReadOnlyProperty<Any?, List<T>> = listOfSpec(MetaConverter.serializable(descriptor), key)
+    descriptor: MetaDescriptor? = null,
+): MetaDelegate<List<T>> = listOfSpec(MetaConverter.serializable(descriptor), key)
 
 /**
  * A property delegate that uses custom key
  */
-public fun MetaProvider.value(key: Name? = null): ReadOnlyProperty<Any?, Value?> = ReadOnlyProperty { _, property ->
-    get(key ?: property.name.asName())?.value
+public fun MetaProvider.value(
+    key: Name? = null,
+    descriptor: MetaDescriptor? = null,
+): MetaDelegate<Value?> = object : MetaDelegate<Value?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Value? = get(key ?: property.name.asName())?.value
+
+    override val descriptor: MetaDescriptor? = descriptor
 }
 
 public fun <R> MetaProvider.value(
     key: Name? = null,
+    descriptor: MetaDescriptor? = null,
     reader: (Value?) -> R,
-): ReadOnlyProperty<Any?, R> = ReadOnlyProperty { _, property ->
-    reader(get(key ?: property.name.asName())?.value)
+): MetaDelegate<R> = object : MetaDelegate<R> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): R = reader(get(key ?: property.name.asName())?.value)
+
+    override val descriptor: MetaDescriptor? = descriptor
 }
 
 //TODO add caching for sealed nodes
 
 /* Read-only delegates for [Meta] */
 
-public fun MetaProvider.string(key: Name? = null): ReadOnlyProperty<Any?, String?> = value(key) { it?.string }
+public fun MetaProvider.string(key: Name? = null): MetaDelegate<String?> = value(key = key) { it?.string }
 
-public fun MetaProvider.boolean(key: Name? = null): ReadOnlyProperty<Any?, Boolean?> = value(key) { it?.boolean }
+public fun MetaProvider.boolean(key: Name? = null): MetaDelegate<Boolean?> = value(key = key) { it?.boolean }
 
-public fun MetaProvider.number(key: Name? = null): ReadOnlyProperty<Any?, Number?> = value(key) { it?.numberOrNull }
+public fun MetaProvider.number(key: Name? = null): MetaDelegate<Number?> = value(key = key) { it?.numberOrNull }
 
-public fun MetaProvider.double(key: Name? = null): ReadOnlyProperty<Any?, Double?> = value(key) { it?.double }
+public fun MetaProvider.double(key: Name? = null): MetaDelegate<Double?> = value(key = key) { it?.double }
 
-public fun MetaProvider.float(key: Name? = null): ReadOnlyProperty<Any?, Float?> = value(key) { it?.float }
+public fun MetaProvider.float(key: Name? = null): MetaDelegate<Float?> = value(key = key) { it?.float }
 
-public fun MetaProvider.int(key: Name? = null): ReadOnlyProperty<Any?, Int?> = value(key) { it?.int }
+public fun MetaProvider.int(key: Name? = null): MetaDelegate<Int?> = value(key = key) { it?.int }
 
-public fun MetaProvider.long(key: Name? = null): ReadOnlyProperty<Any?, Long?> = value(key) { it?.long }
+public fun MetaProvider.long(key: Name? = null): MetaDelegate<Long?> = value(key = key) { it?.long }
 
-public fun MetaProvider.string(default: String, key: Name? = null): ReadOnlyProperty<Any?, String> =
-    value(key) { it?.string ?: default }
+public fun MetaProvider.string(default: String, key: Name? = null): MetaDelegate<String> =
+    value(key = key) { it?.string ?: default }
 
-public fun MetaProvider.boolean(default: Boolean, key: Name? = null): ReadOnlyProperty<Any?, Boolean> =
-    value(key) { it?.boolean ?: default }
+public fun MetaProvider.boolean(default: Boolean, key: Name? = null): MetaDelegate<Boolean> =
+    value(key = key) { it?.boolean ?: default }
 
-public fun MetaProvider.number(default: Number, key: Name? = null): ReadOnlyProperty<Any?, Number> =
-    value(key) { it?.numberOrNull ?: default }
+public fun MetaProvider.number(default: Number, key: Name? = null): MetaDelegate<Number> =
+    value(key = key) { it?.numberOrNull ?: default }
 
-public fun MetaProvider.double(default: Double, key: Name? = null): ReadOnlyProperty<Any?, Double> =
-    value(key) { it?.double ?: default }
+public fun MetaProvider.double(default: Double, key: Name? = null): MetaDelegate<Double> =
+    value(key = key) { it?.double ?: default }
 
-public fun MetaProvider.float(default: Float, key: Name? = null): ReadOnlyProperty<Any?, Float> =
-    value(key) { it?.float ?: default }
+public fun MetaProvider.float(default: Float, key: Name? = null): MetaDelegate<Float> =
+    value(key = key) { it?.float ?: default }
 
-public fun MetaProvider.int(default: Int, key: Name? = null): ReadOnlyProperty<Any?, Int> =
-    value(key) { it?.int ?: default }
+public fun MetaProvider.int(default: Int, key: Name? = null): MetaDelegate<Int> =
+    value(key = key) { it?.int ?: default }
 
-public fun MetaProvider.long(default: Long, key: Name? = null): ReadOnlyProperty<Any?, Long> =
-    value(key) { it?.long ?: default }
+public fun MetaProvider.long(default: Long, key: Name? = null): MetaDelegate<Long> =
+    value(key = key) { it?.long ?: default }
 
-public inline fun <reified E : Enum<E>> MetaProvider.enum(default: E, key: Name? = null): ReadOnlyProperty<Any?, E> =
-    value<E>(key) { it?.enum<E>() ?: default }
+public inline fun <reified E : Enum<E>> MetaProvider.enum(default: E, key: Name? = null): MetaDelegate<E> =
+    value<E>(key = key) { it?.enum<E>() ?: default }
 
-public fun MetaProvider.string(key: Name? = null, default: () -> String): ReadOnlyProperty<Any?, String> =
-    value(key) { it?.string ?: default() }
+public fun MetaProvider.string(key: Name? = null, default: () -> String): MetaDelegate<String> =
+    value(key = key) { it?.string ?: default() }
 
-public fun MetaProvider.boolean(key: Name? = null, default: () -> Boolean): ReadOnlyProperty<Any?, Boolean> =
-    value(key) { it?.boolean ?: default() }
+public fun MetaProvider.boolean(key: Name? = null, default: () -> Boolean): MetaDelegate<Boolean> =
+    value(key = key) { it?.boolean ?: default() }
 
-public fun MetaProvider.number(key: Name? = null, default: () -> Number): ReadOnlyProperty<Any?, Number> =
-    value(key) { it?.numberOrNull ?: default() }
+public fun MetaProvider.number(key: Name? = null, default: () -> Number): MetaDelegate<Number> =
+    value(key = key) { it?.numberOrNull ?: default() }
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt
index e308a63d..37140c6f 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMetaDelegate.kt
@@ -1,5 +1,6 @@
 package space.kscience.dataforge.meta
 
+import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
@@ -8,20 +9,28 @@ import space.kscience.dataforge.names.getIndexedList
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
+
 /* Read-write delegates */
 
-public fun MutableMetaProvider.node(key: Name? = null): ReadWriteProperty<Any?, Meta?> =
-    object : ReadWriteProperty<Any?, Meta?> {
-        override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
-            return get(key ?: property.name.asName())
-        }
+public interface MutableMetaDelegate<T> : ReadWriteProperty<Any?, T>, Described
 
-        override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
-            val name = key ?: property.name.asName()
-            set(name, value)
-        }
+public fun MutableMetaProvider.node(
+    key: Name? = null,
+    descriptor: MetaDescriptor? = null,
+): MutableMetaDelegate<Meta?> = object : MutableMetaDelegate<Meta?> {
+
+    override val descriptor: MetaDescriptor? = descriptor
+
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
+        return get(key ?: property.name.asName())
     }
 
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
+        val name = key ?: property.name.asName()
+        set(name, value)
+    }
+}
+
 /**
  * Use [converter] to transform an object to Meta and back.
  * Note that mutation of the object does not change Meta.
@@ -29,21 +38,24 @@ public fun MutableMetaProvider.node(key: Name? = null): ReadWriteProperty<Any?,
 public fun <T> MutableMetaProvider.convertable(
     converter: MetaConverter<T>,
     key: Name? = null,
-): ReadWriteProperty<Any?, T?> =
-    object : ReadWriteProperty<Any?, T?> {
-        override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
-            val name = key ?: property.name.asName()
-            return get(name)?.let { converter.read(it) }
-        }
+): MutableMetaDelegate<T?> = object : MutableMetaDelegate<T?> {
 
-        override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) {
-            val name = key ?: property.name.asName()
-            set(name, value?.let { converter.convert(it) })
-        }
+    override val descriptor: MetaDescriptor? get() = converter.descriptor
+
+
+    override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
+        val name = key ?: property.name.asName()
+        return get(name)?.let { converter.read(it) }
     }
 
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) {
+        val name = key ?: property.name.asName()
+        set(name, value?.let { converter.convert(it) })
+    }
+}
+
 @Deprecated("Use convertable", ReplaceWith("convertable(converter, key)"))
-public fun <T> MutableMetaProvider.node(key: Name? = null, converter: MetaConverter<T>): ReadWriteProperty<Any?, T?> =
+public fun <T> MutableMetaProvider.node(key: Name? = null, converter: MetaConverter<T>): MutableMetaDelegate<T?> =
     convertable(converter, key)
 
 /**
@@ -54,7 +66,7 @@ public fun <T> MutableMetaProvider.node(key: Name? = null, converter: MetaConver
 public inline fun <reified T> MutableMetaProvider.serializable(
     descriptor: MetaDescriptor? = null,
     key: Name? = null,
-): ReadWriteProperty<Any?, T?> = convertable(MetaConverter.serializable(descriptor), key)
+): MutableMetaDelegate<T?> = convertable(MetaConverter.serializable(descriptor), key)
 
 /**
  * Use [converter] to convert a list of same name siblings meta to object and back.
@@ -63,7 +75,9 @@ public inline fun <reified T> MutableMetaProvider.serializable(
 public fun <T> MutableMeta.listOfConvertable(
     converter: MetaConverter<T>,
     key: Name? = null,
-): ReadWriteProperty<Any?, List<T>> = object : ReadWriteProperty<Any?, List<T>> {
+): MutableMetaDelegate<List<T>> = object : MutableMetaDelegate<List<T>> {
+    override val descriptor: MetaDescriptor? = converter.descriptor?.copy(multiple = true)
+
     override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {
         val name = key ?: property.name.asName()
         return getIndexedList(name).map { converter.read(it) }
@@ -77,26 +91,33 @@ public fun <T> MutableMeta.listOfConvertable(
 
 @DFExperimental
 public inline fun <reified T> MutableMeta.listOfSerializable(
-    descriptor: MetaDescriptor? = null,
     key: Name? = null,
-): ReadWriteProperty<Any?, List<T>> = listOfConvertable(MetaConverter.serializable(descriptor), key)
+    descriptor: MetaDescriptor? = null,
+): MutableMetaDelegate<List<T>> = listOfConvertable(MetaConverter.serializable(descriptor), key)
 
 
-public fun MutableMetaProvider.value(key: Name? = null): ReadWriteProperty<Any?, Value?> =
-    object : ReadWriteProperty<Any?, Value?> {
-        override fun getValue(thisRef: Any?, property: KProperty<*>): Value? =
-            get(key ?: property.name.asName())?.value
+public fun MutableMetaProvider.value(
+    key: Name? = null,
+    descriptor: MetaDescriptor? = null,
+): MutableMetaDelegate<Value?> = object : MutableMetaDelegate<Value?> {
+    override val descriptor: MetaDescriptor? = descriptor
 
-        override fun setValue(thisRef: Any?, property: KProperty<*>, value: Value?) {
-            setValue(key ?: property.name.asName(), value)
-        }
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Value? =
+        get(key ?: property.name.asName())?.value
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Value?) {
+        setValue(key ?: property.name.asName(), value)
     }
+}
 
 public fun <T> MutableMetaProvider.value(
     key: Name? = null,
     writer: (T) -> Value? = { Value.of(it) },
+    descriptor: MetaDescriptor? = null,
     reader: (Value?) -> T,
-): ReadWriteProperty<Any?, T> = object : ReadWriteProperty<Any?, T> {
+): MutableMetaDelegate<T> = object : MutableMetaDelegate<T> {
+    override val descriptor: MetaDescriptor? = descriptor
+
     override fun getValue(thisRef: Any?, property: KProperty<*>): T =
         reader(get(key ?: property.name.asName())?.value)
 
@@ -107,65 +128,65 @@ public fun <T> MutableMetaProvider.value(
 
 /* Read-write delegates for [MutableItemProvider] */
 
-public fun MutableMetaProvider.string(key: Name? = null): ReadWriteProperty<Any?, String?> =
+public fun MutableMetaProvider.string(key: Name? = null): MutableMetaDelegate<String?> =
     value(key) { it?.string }
 
-public fun MutableMetaProvider.boolean(key: Name? = null): ReadWriteProperty<Any?, Boolean?> =
+public fun MutableMetaProvider.boolean(key: Name? = null): MutableMetaDelegate<Boolean?> =
     value(key) { it?.boolean }
 
-public fun MutableMetaProvider.number(key: Name? = null): ReadWriteProperty<Any?, Number?> =
+public fun MutableMetaProvider.number(key: Name? = null): MutableMetaDelegate<Number?> =
     value(key) { it?.number }
 
-public fun MutableMetaProvider.string(default: String, key: Name? = null): ReadWriteProperty<Any?, String> =
+public fun MutableMetaProvider.string(default: String, key: Name? = null): MutableMetaDelegate<String> =
     value(key) { it?.string ?: default }
 
-public fun MutableMetaProvider.boolean(default: Boolean, key: Name? = null): ReadWriteProperty<Any?, Boolean> =
+public fun MutableMetaProvider.boolean(default: Boolean, key: Name? = null): MutableMetaDelegate<Boolean> =
     value(key) { it?.boolean ?: default }
 
-public fun MutableMetaProvider.number(default: Number, key: Name? = null): ReadWriteProperty<Any?, Number> =
+public fun MutableMetaProvider.number(default: Number, key: Name? = null): MutableMetaDelegate<Number> =
     value(key) { it?.number ?: default }
 
-public fun MutableMetaProvider.string(key: Name? = null, default: () -> String): ReadWriteProperty<Any?, String> =
+public fun MutableMetaProvider.string(key: Name? = null, default: () -> String): MutableMetaDelegate<String> =
     value(key) { it?.string ?: default() }
 
-public fun MutableMetaProvider.boolean(key: Name? = null, default: () -> Boolean): ReadWriteProperty<Any?, Boolean> =
+public fun MutableMetaProvider.boolean(key: Name? = null, default: () -> Boolean): MutableMetaDelegate<Boolean> =
     value(key) { it?.boolean ?: default() }
 
-public fun MutableMetaProvider.number(key: Name? = null, default: () -> Number): ReadWriteProperty<Any?, Number> =
+public fun MutableMetaProvider.number(key: Name? = null, default: () -> Number): MutableMetaDelegate<Number> =
     value(key) { it?.number ?: default() }
 
 public inline fun <reified E : Enum<E>> MutableMetaProvider.enum(
     default: E,
     key: Name? = null,
-): ReadWriteProperty<Any?, E> = value(key) { value -> value?.string?.let { enumValueOf<E>(it) } ?: default }
+): MutableMetaDelegate<E> = value(key) { value -> value?.string?.let { enumValueOf<E>(it) } ?: default }
 
 /* Number delegates */
 
-public fun MutableMetaProvider.int(key: Name? = null): ReadWriteProperty<Any?, Int?> =
+public fun MutableMetaProvider.int(key: Name? = null): MutableMetaDelegate<Int?> =
     value(key) { it?.int }
 
-public fun MutableMetaProvider.double(key: Name? = null): ReadWriteProperty<Any?, Double?> =
+public fun MutableMetaProvider.double(key: Name? = null): MutableMetaDelegate<Double?> =
     value(key) { it?.double }
 
-public fun MutableMetaProvider.long(key: Name? = null): ReadWriteProperty<Any?, Long?> =
+public fun MutableMetaProvider.long(key: Name? = null): MutableMetaDelegate<Long?> =
     value(key) { it?.long }
 
-public fun MutableMetaProvider.float(key: Name? = null): ReadWriteProperty<Any?, Float?> =
+public fun MutableMetaProvider.float(key: Name? = null): MutableMetaDelegate<Float?> =
     value(key) { it?.float }
 
 
 /* Safe number delegates*/
 
-public fun MutableMetaProvider.int(default: Int, key: Name? = null): ReadWriteProperty<Any?, Int> =
+public fun MutableMetaProvider.int(default: Int, key: Name? = null): MutableMetaDelegate<Int> =
     value(key) { it?.int ?: default }
 
-public fun MutableMetaProvider.double(default: Double, key: Name? = null): ReadWriteProperty<Any?, Double> =
+public fun MutableMetaProvider.double(default: Double, key: Name? = null): MutableMetaDelegate<Double> =
     value(key) { it?.double ?: default }
 
-public fun MutableMetaProvider.long(default: Long, key: Name? = null): ReadWriteProperty<Any?, Long> =
+public fun MutableMetaProvider.long(default: Long, key: Name? = null): MutableMetaDelegate<Long> =
     value(key) { it?.long ?: default }
 
-public fun MutableMetaProvider.float(default: Float, key: Name? = null): ReadWriteProperty<Any?, Float> =
+public fun MutableMetaProvider.float(default: Float, key: Name? = null): MutableMetaDelegate<Float> =
     value(key) { it?.float ?: default }
 
 
@@ -174,7 +195,7 @@ public fun MutableMetaProvider.float(default: Float, key: Name? = null): ReadWri
 public fun MutableMetaProvider.stringList(
     vararg default: String,
     key: Name? = null,
-): ReadWriteProperty<Any?, List<String>> = value(
+): MutableMetaDelegate<List<String>> = value(
     key,
     writer = { list -> list.map { str -> str.asValue() }.asValue() },
     reader = { it?.stringList ?: listOf(*default) },
@@ -182,7 +203,7 @@ public fun MutableMetaProvider.stringList(
 
 public fun MutableMetaProvider.stringList(
     key: Name? = null,
-): ReadWriteProperty<Any?, List<String>?> = value(
+): MutableMetaDelegate<List<String>?> = value(
     key,
     writer = { it -> it?.map { str -> str.asValue() }?.asValue() },
     reader = { it?.stringList },
@@ -191,7 +212,7 @@ public fun MutableMetaProvider.stringList(
 public fun MutableMetaProvider.numberList(
     vararg default: Number,
     key: Name? = null,
-): ReadWriteProperty<Any?, List<Number>> = value(
+): MutableMetaDelegate<List<Number>> = value(
     key,
     writer = { it.map { num -> num.asValue() }.asValue() },
     reader = { it?.list?.map { value -> value.numberOrNull ?: Double.NaN } ?: listOf(*default) },
@@ -202,7 +223,7 @@ public fun <T> MutableMetaProvider.listValue(
     key: Name? = null,
     writer: (T) -> Value = { Value.of(it) },
     reader: (Value) -> T,
-): ReadWriteProperty<Any?, List<T>?> = value(
+): MutableMetaDelegate<List<T>?> = value(
     key,
     writer = { it?.map(writer)?.asValue() },
     reader = { it?.list?.map(reader) }
diff --git a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/CachingAction.kt b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/CachingAction.kt
new file mode 100644
index 00000000..5f88ab74
--- /dev/null
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/CachingAction.kt
@@ -0,0 +1,19 @@
+package space.kscience.dataforge.workspace
+
+import space.kscience.dataforge.actions.AbstractAction
+import space.kscience.dataforge.data.*
+import space.kscience.dataforge.meta.Meta
+import kotlin.reflect.KType
+
+internal class CachingAction<T>(type: KType, private val caching: (NamedData<T>) -> NamedData<T>) :
+    AbstractAction<T, T>(type) {
+    override fun DataSink<T>.generate(source: DataTree<T>, meta: Meta) {
+        source.forEach {
+            put(caching(it))
+        }
+    }
+
+    override suspend fun DataSink<T>.update(source: DataTree<T>, meta: Meta, updatedData: DataUpdate<T>) {
+        put(updatedData.name, updatedData.data?.named(updatedData.name)?.let(caching))
+    }
+}
\ No newline at end of file
diff --git a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
index da09c095..4d2578e5 100644
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
@@ -1,20 +1,22 @@
 package space.kscience.dataforge.workspace
 
-import kotlinx.coroutines.flow.filterIsInstance
-import kotlinx.coroutines.flow.map
 import kotlinx.io.*
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.protobuf.ProtoBuf
 import kotlinx.serialization.serializer
+import space.kscience.dataforge.actions.Action
+import space.kscience.dataforge.actions.invoke
 import space.kscience.dataforge.context.error
 import space.kscience.dataforge.context.logger
 import space.kscience.dataforge.context.request
-import space.kscience.dataforge.data.*
+import space.kscience.dataforge.data.Data
+import space.kscience.dataforge.data.await
+import space.kscience.dataforge.data.named
 import space.kscience.dataforge.io.*
 import space.kscience.dataforge.misc.DFExperimental
-import space.kscience.dataforge.misc.DFInternal
+import space.kscience.dataforge.misc.UnsafeKType
 import space.kscience.dataforge.names.withIndex
 import java.nio.file.Path
 import kotlin.io.path.deleteIfExists
@@ -52,7 +54,8 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
 
     //    private fun <T : Any> TaskData<*>.checkType(taskType: KType): TaskData<T> = this as TaskData<T>
 
-    @OptIn(DFExperimental::class, DFInternal::class)
+
+    @OptIn(DFExperimental::class, UnsafeKType::class)
     override suspend fun <T> cache(result: TaskResult<T>): TaskResult<T> {
         val io = result.workspace.context.request(IOPlugin)
 
@@ -60,8 +63,8 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
             ?: ProtobufIOFormat(result.dataType)
             ?: error("Can't resolve IOFormat for ${result.dataType}")
 
-        fun cacheOne(data: NamedData<T>): NamedData<T> {
 
+        val cachingAction: Action<T, T> = CachingAction(result.dataType) { data ->
             val path = cacheDirectory /
                     result.taskName.withIndex(result.taskMeta.hashCode().toString(16)).toString() /
                     data.name.toString()
@@ -80,7 +83,7 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
                     }
                 }
 
-                //waiting for data in current scope because Envelope is synchronous
+                //waiting for data in the current scope because Envelope is synchronous
                 return@Data data.await().also { result ->
                     val envelope = Envelope {
                         meta = data.meta
@@ -92,12 +95,10 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
                 }
 
             }
-            return datum.named(data.name)
+            datum.named(data.name)
         }
 
-
-        val cachedTree = result.asSequence().map { cacheOne(it) }
-            .toTree(result.dataType, result.updates.filterIsInstance<NamedData<T>>().map { cacheOne(it) })
+        val cachedTree = cachingAction(result)
 
         return result.workspace.wrapResult(cachedTree, result.taskName, result.taskMeta)
     }
diff --git a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/InMemoryWorkspaceCache.kt b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/InMemoryWorkspaceCache.kt
index f3b2ee15..8ba39ec1 100644
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/InMemoryWorkspaceCache.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/InMemoryWorkspaceCache.kt
@@ -1,9 +1,11 @@
 package space.kscience.dataforge.workspace
 
-import kotlinx.coroutines.flow.filterIsInstance
-import kotlinx.coroutines.flow.map
-import space.kscience.dataforge.data.*
+import space.kscience.dataforge.actions.Action
+import space.kscience.dataforge.actions.invoke
+import space.kscience.dataforge.data.Data
+import space.kscience.dataforge.data.named
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import kotlin.reflect.KType
 import kotlin.reflect.full.isSubtypeOf
@@ -20,19 +22,18 @@ public class InMemoryWorkspaceCache : WorkspaceCache {
         if (type.isSubtypeOf(taskType)) this as Data<T>
         else error("Cached data type mismatch: expected $taskType but got $type")
 
+    @OptIn(DFExperimental::class)
     override suspend fun <T> cache(result: TaskResult<T>): TaskResult<T> {
-        fun cacheOne(data: NamedData<T>): NamedData<T> {
+        val cachingAction: Action<T, T> = CachingAction(result.dataType) { data ->
             val cachedData =  cache.getOrPut(TaskResultId(result.taskName, result.taskMeta)){
                 HashMap()
             }.getOrPut(data.name){
                 data.data
             }
-            return cachedData.checkType<T>(result.dataType).named(data.name)
+            cachedData.checkType<T>(result.dataType).named(data.name)
         }
 
-
-        val cachedTree = result.asSequence().map { cacheOne(it) }
-            .toTree(result.dataType, result.updates.filterIsInstance<NamedData<T>>().map { cacheOne(it) })
+        val cachedTree = cachingAction(result)
 
         return result.workspace.wrapResult(cachedTree, result.taskName, result.taskMeta)
     }
diff --git a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
index 837b61bc..39837c15 100644
--- a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/SimpleWorkspaceTest.kt
@@ -148,16 +148,16 @@ internal class SimpleWorkspaceTest {
     }
 
     @Test
-    fun testWorkspace() = runTest(timeout = 10.milliseconds) {
+    fun testWorkspace() = runTest(timeout = 100.milliseconds) {
         val node = workspace.produce("sum")
         val res = node.asSequence().single()
         assertEquals(328350, res.await())
     }
 
     @Test
-    fun testMetaPropagation() = runTest(timeout = 10.milliseconds) {
+    fun testMetaPropagation() = runTest(timeout = 100.milliseconds) {
         val node = workspace.produce("sum") { "testFlag" put true }
-        val res = node.data!!.await()
+        val res = node["sum"]!!.await()
     }
 
     @Test
@@ -186,7 +186,7 @@ internal class SimpleWorkspaceTest {
         val node = workspace.produce("filterOne") {
             "name" put "myData[12]"
         }
-        assertEquals(12, node.data!!.await())
+        assertEquals(12, node.asSequence().first().await())
     }
 
 }
\ No newline at end of file