40 changed files with 221 additions and 318 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -14,22 +14,6 @@

 ### Security

-## 0.9.0 - 2024-06-04
-
-### Added
-
- Custom CoroutineContext during `Context` creation.
-
-### Changed
-
- Kotlin 2.0
- `MetaSpec` renamed to `MetaReader`. MetaSpec is now reserved for builder-based generation of meta descriptors.
- Add self-type for Meta. Remove unsafe cast method for meta instances.
-
-### Removed
-
- Automatic descriptors for schema. It is not possible to implement them without heavy reflection.
-
 ## 0.8.2 - 2024-04-27

 ### Added
--- a/build.gradle.kts
+++ b/build.gradle.kts
@ -3,21 +3,21 @@ import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam

 plugins {
-    alias(spclibs.plugins.kscience.project)
-    alias(spclibs.plugins.kotlinx.kover)
+    id("space.kscience.gradle.project")
+    id("org.jetbrains.kotlinx.kover") version "0.7.6"
 }

 allprojects {
    group = "space.kscience"
-    version = "0.9.0"
+    version = "0.8.2"
 }

 subprojects {
    apply(plugin = "maven-publish")

    tasks.withType<KotlinCompile> {
-        compilerOptions {
-            freeCompilerArgs.add("-Xcontext-receivers")
+        kotlinOptions {
+            freeCompilerArgs = freeCompilerArgs + "-Xcontext-receivers"
        }
    }
 }
--- a/dataforge-context/README.md
+++ b/dataforge-context/README.md
@ -6,7 +6,7 @@ Context and provider definitions

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-context:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-context:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-context:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-context:0.8.2")
 }
 ```
--- a/dataforge-context/api/dataforge-context.api
+++ b/dataforge-context/api/dataforge-context.api
@ -57,7 +57,6 @@ public abstract interface class space/kscience/dataforge/context/ContextAware {

 public final class space/kscience/dataforge/context/ContextBuilder {
 	public final fun build ()Lspace/kscience/dataforge/context/Context;
-	public final fun coroutineContext (Lkotlin/coroutines/CoroutineContext;)V
 	public final fun getName ()Lspace/kscience/dataforge/names/Name;
 	public final fun plugin (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)V
 	public final fun plugin (Lspace/kscience/dataforge/context/Plugin;)V
@ -70,6 +69,9 @@ public final class space/kscience/dataforge/context/ContextBuilder {
 	public final fun properties (Lkotlin/jvm/functions/Function1;)V
 }

+public final class space/kscience/dataforge/context/ContextBuilderKt {
+}
+
 public final class space/kscience/dataforge/context/DefaultLogManager : space/kscience/dataforge/context/AbstractPlugin, space/kscience/dataforge/context/LogManager {
 	public static final field Companion Lspace/kscience/dataforge/context/DefaultLogManager$Companion;
 	public fun <init> ()V
@ -210,14 +212,14 @@ public final class space/kscience/dataforge/context/PluginTag : space/kscience/d
 	public fun toString ()Ljava/lang/String;
 }

-public synthetic class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public final class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/context/PluginTag$$serializer;
-	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/context/PluginTag;
-	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/context/PluginTag;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/context/PluginTag;)V
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/context/PluginTag;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }

@ -262,6 +264,15 @@ public abstract interface annotation class space/kscience/dataforge/descriptors/
 public abstract interface annotation class space/kscience/dataforge/descriptors/Multiple : java/lang/annotation/Annotation {
 }

+public final class space/kscience/dataforge/descriptors/ReflectiveDescriptorsKt {
+}
+
+public final class space/kscience/dataforge/properties/MetaAsFlowKt {
+}
+
+public final class space/kscience/dataforge/provider/DfTypeKt {
+}
+
 public final class space/kscience/dataforge/provider/Path : java/lang/Iterable, kotlin/jvm/internal/markers/KMappedMarker {
 	public static final field Companion Lspace/kscience/dataforge/provider/Path$Companion;
 	public static final field PATH_SEGMENT_SEPARATOR Ljava/lang/String;
--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Context.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Context.kt
@ -10,7 +10,6 @@ import space.kscience.dataforge.misc.ThreadSafe
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider
 import kotlin.coroutines.CoroutineContext
-import kotlin.coroutines.EmptyCoroutineContext

 /**
 * The local environment for anything being done in DataForge framework. Contexts are organized into tree structure with [Global] at the top.
@ -27,7 +26,6 @@ public open class Context internal constructor(
    public val parent: Context?,
    plugins: Set<Plugin>, // set of unattached plugins
    meta: Meta,
-    coroutineContext: CoroutineContext = EmptyCoroutineContext,
 ) : Named, MetaRepr, Provider, CoroutineScope {

    /**
@ -67,7 +65,7 @@ public open class Context internal constructor(

    override val coroutineContext: CoroutineContext by lazy {
        (parent ?: Global).coroutineContext.let { parenContext ->
-            parenContext + coroutineContext + SupervisorJob(parenContext[Job])
+            parenContext + SupervisorJob(parenContext[Job])
        }
    }

--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/ContextBuilder.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/ContextBuilder.kt
@ -13,8 +13,6 @@ import space.kscience.dataforge.names.plus
 import kotlin.collections.component1
 import kotlin.collections.component2
 import kotlin.collections.set
-import kotlin.coroutines.CoroutineContext
-import kotlin.coroutines.EmptyCoroutineContext

 /**
 * A convenience builder for context
@ -61,15 +59,8 @@ public class ContextBuilder internal constructor(
        plugin(DeFactoPluginFactory(plugin))
    }

-    private var coroutineContext: CoroutineContext = EmptyCoroutineContext
-
-    public fun coroutineContext(coroutineContext: CoroutineContext) {
-        this.coroutineContext = coroutineContext
-    }
-
-
    public fun build(): Context {
-        val contextName = name ?: NameToken("@auto", hashCode().toUInt().toString(16)).asName()
+        val contextName = name ?: NameToken("@auto",hashCode().toUInt().toString(16)).asName()
        val plugins = HashMap<PluginTag, Plugin>()

        fun addPlugin(factory: PluginFactory<*>, meta: Meta) {
@ -95,7 +86,7 @@ public class ContextBuilder internal constructor(
            addPlugin(factory, meta)
        }

-        return Context(contextName, parent, plugins.values.toSet(), meta.seal(), coroutineContext)
+        return Context(contextName, parent, plugins.values.toSet(), meta.seal())
    }
 }

--- a/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/metaAsFlow.kt
+++ b/dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/metaAsFlow.kt
@ -10,7 +10,7 @@ import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.misc.DFExperimental

@DFExperimental
-public fun <T> ObservableMeta.asFlow(converter: MetaReader<T>): Flow<T> = callbackFlow {
+public fun <T> ObservableMeta.asFlow(converter: MetaSpec<T>): Flow<T> = callbackFlow {
    onChange(this){
        trySend(converter.read(this))
    }
--- a/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt
+++ b/dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt
@ -4,12 +4,18 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.decodeFromStream
 import org.slf4j.LoggerFactory
+import space.kscience.dataforge.meta.Scheme
+import space.kscience.dataforge.meta.SchemeSpec
+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.KAnnotatedElement
-import kotlin.reflect.KProperty
+import kotlin.reflect.KClass
+import kotlin.reflect.full.isSubclassOf
+import kotlin.reflect.full.memberProperties
+

 /**
 * Description text for meta property, node or whole object
@ -53,8 +59,18 @@ private fun MetaDescriptorBuilder.loadDescriptorFromResource(resource: Descripto
 }

@DFExperimental
-public fun MetaDescriptorBuilder.forAnnotatedElement(element: KAnnotatedElement) {
-    element.annotations.forEach {
+public fun MetaDescriptor.Companion.forClass(
+    kClass: KClass<out Any>,
+    mod: MetaDescriptorBuilder.() -> Unit = {},
+): MetaDescriptor = MetaDescriptor {
+    when {
+        kClass.isSubclassOf(Number::class) -> valueType(ValueType.NUMBER)
+        kClass == String::class -> ValueType.STRING
+        kClass == Boolean::class -> ValueType.BOOLEAN
+        kClass == DoubleArray::class -> ValueType.LIST
+    }
+
+    kClass.annotations.forEach {
        when (it) {
            is Description -> description = it.value

@ -63,70 +79,47 @@ public fun MetaDescriptorBuilder.forAnnotatedElement(element: KAnnotatedElement)
            is DescriptorUrl -> loadDescriptorFromUrl(URL(it.url))
        }
    }
+    kClass.memberProperties.forEach { property ->
+
+        var flag = false
+
+        val descriptor = MetaDescriptor {
+            //use base type descriptor as a base
+            (property.returnType.classifier as? KClass<*>)?.let {
+                from(forClass(it))
+            }
+
+            property.annotations.forEach {
+                when (it) {
+                    is Description -> {
+                        description = it.value
+                        flag = true
+                    }
+
+                    is Multiple -> {
+                        multiple = true
+                        flag = true
+                    }
+
+                    is DescriptorResource -> {
+                        loadDescriptorFromResource(it)
+                        flag = true
+                    }
+
+                    is DescriptorUrl -> {
+                        loadDescriptorFromUrl(URL(it.url))
+                        flag = true
+                    }
+                }
+            }
+        }
+        if (flag) {
+            node(property.name, descriptor)
+        }
+    }
+    mod()
 }

@DFExperimental
-public fun MetaDescriptorBuilder.forProperty(property: KProperty<*>) {
-    property.annotations.forEach {
-        when (it) {
-            is Description -> description = it.value
-
-            is DescriptorResource -> loadDescriptorFromResource(it)
-
-            is DescriptorUrl -> loadDescriptorFromUrl(URL(it.url))
-        }
-    }
-}
-//
-//@DFExperimental
-//public fun <T : Scheme> MetaDescriptor.Companion.forScheme(
-//    spec: SchemeSpec<T>,
-//    mod: MetaDescriptorBuilder.() -> Unit = {},
-//): MetaDescriptor = MetaDescriptor {
-//    val scheme = spec.empty()
-//    val kClass: KClass<T> = scheme::class as KClass<T>
-//    when {
-//        kClass.isSubclassOf(Number::class) -> valueType(ValueType.NUMBER)
-//        kClass == String::class -> ValueType.STRING
-//        kClass == Boolean::class -> ValueType.BOOLEAN
-//        kClass == DoubleArray::class -> ValueType.LIST
-//        kClass == ByteArray::class -> ValueType.LIST
-//    }
-//
-//    forAnnotatedElement(kClass)
-//    kClass.memberProperties.forEach { property ->
-//        node(property.name) {
-//
-//            (property.getDelegate(scheme) as? MetaDelegate<*>)?.descriptor?.let {
-//                from(it)
-//            }
-//
-//            property.annotations.forEach {
-//                when (it) {
-//                    is Description -> {
-//                        description = it.value
-//                    }
-//
-//                    is Multiple -> {
-//                        multiple = true
-//                    }
-//
-//                    is DescriptorResource -> {
-//                        loadDescriptorFromResource(it)
-//                    }
-//
-//                    is DescriptorUrl -> {
-//                        loadDescriptorFromUrl(URL(it.url))
-//                    }
-//                }
-//            }
-//        }
-//
-//    }
-//    mod()
-//}
-//
-//@DFExperimental
-//public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor(
-//    noinline mod: MetaDescriptorBuilder.() -> Unit = {},
-//): MetaDescriptor = MetaDescriptor.forScheme(this, mod)
+public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor(noinline mod: MetaDescriptorBuilder.() -> Unit = {}): MetaDescriptor =
+    MetaDescriptor.forClass(T::class, mod)
--- a/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt
+++ b/dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt
@ -2,28 +2,35 @@

 package space.kscience.dataforge.descriptors

+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import org.junit.jupiter.api.Test
+import space.kscience.dataforge.meta.Scheme
+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

-//
-//class TestScheme : Scheme() {
-//
-//    @Description("A")
-//    val a by string()
-//
-//    @Description("B")
-//    val b by int()
-//
-//    val c by int()
-//
-//    companion object : SchemeSpec<TestScheme>(::TestScheme) {
-//        override val descriptor: MetaDescriptor = autoDescriptor()
-//    }
-//}
-//
-//class TestAutoDescriptors {
-//    @Test
-//    fun autoDescriptor() {
-//        val autoDescriptor = MetaDescriptor.forScheme(TestScheme)
-//        println(Json { prettyPrint = true }.encodeToString(autoDescriptor))
-//    }
-//}
+private class TestScheme : Scheme() {
+
+    @Description("A")
+    val a by string()
+
+    @Description("B")
+    val b by int()
+
+    val c by int()
+
+    companion object : SchemeSpec<TestScheme>(::TestScheme) {
+        override val descriptor: MetaDescriptor = autoDescriptor()
+    }
+}
+
+class TestAutoDescriptors {
+    @Test
+    fun autoDescriptor() {
+        val autoDescriptor = MetaDescriptor.forClass(TestScheme::class)
+        println(Json { prettyPrint = true }.encodeToString(autoDescriptor))
+    }
+}
--- a/dataforge-data/README.md
+++ b/dataforge-data/README.md
@ -6,7 +6,7 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-data:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-data:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-data:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-data:0.8.2")
 }
 ```
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt
@ -18,24 +18,6 @@ public data class NamedValueWithMeta<T>(val name: Name, val value: T, val meta:
 public suspend fun <T> NamedData<T>.awaitWithMeta(): NamedValueWithMeta<T> =
    NamedValueWithMeta(name, await(), meta)

-/**
- * Lazily transform this data to another data. By convention [block] should not use external data (be pure).
- * @param type explicit type of the resulting [Data]
- * @param coroutineContext additional [CoroutineContext] elements used for data computation.
- * @param meta for the resulting data. By default equals input data.
- * @param block the transformation itself
- */
-@UnsafeKType
-public fun <T, R> Data<T>.transform(
-    type: KType,
-    meta: Meta = this.meta,
-    coroutineContext: CoroutineContext = EmptyCoroutineContext,
-    block: suspend (T) -> R,
-): Data<R> = Data(type, meta, coroutineContext, listOf(this)) {
-    block(await())
-}
-
-

 /**
 * Lazily transform this data to another data. By convention [block] should not use external data (be pure).
--- a/dataforge-data/src/jvmTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt
+++ b/dataforge-data/src/jvmTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt
@ -43,7 +43,6 @@ internal class ActionsTest {
        repeat(10) {
            source.updateValue(it.toString(), it)
        }
-
        result.updates.take(10).onEach { println(it.name) }.collect()

        assertEquals(2, result["1"]?.await())
--- a/dataforge-io/README.md
+++ b/dataforge-io/README.md
@ -6,7 +6,7 @@ IO module

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-io:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-io:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-io:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-io:0.8.2")
 }
 ```
--- a/dataforge-io/dataforge-io-yaml/README.md
+++ b/dataforge-io/dataforge-io-yaml/README.md
@ -6,7 +6,7 @@ YAML meta IO

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-io-yaml:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-io-yaml:0.8.2")
 }
 ```
--- a/dataforge-meta/README.md
+++ b/dataforge-meta/README.md
@ -6,7 +6,7 @@ Meta definition and basic operations on meta

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-meta:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-meta:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-meta:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-meta:0.8.2")
 }
 ```
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@ -103,8 +103,6 @@ public final class space/kscience/dataforge/meta/Laminate : space/kscience/dataf
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getItems ()Ljava/util/Map;
 	public final fun getLayers ()Ljava/util/List;
-	public fun getSelf ()Lspace/kscience/dataforge/meta/Laminate;
-	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public final fun merge ()Lspace/kscience/dataforge/meta/SealedMeta;
@ -200,7 +198,7 @@ public final class space/kscience/dataforge/meta/MetaBuilder : space/kscience/da
 public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilderMarker : java/lang/annotation/Annotation {
 }

-public abstract interface class space/kscience/dataforge/meta/MetaConverter : space/kscience/dataforge/meta/MetaReader {
+public abstract interface class space/kscience/dataforge/meta/MetaConverter : space/kscience/dataforge/meta/MetaSpec {
 	public static final field Companion Lspace/kscience/dataforge/meta/MetaConverter$Companion;
 	public abstract fun convert (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
 	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
@ -248,15 +246,15 @@ public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaReader;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$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaReader;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaReader;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun node$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;
@ -264,8 +262,8 @@ public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	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$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;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;
@ -296,6 +294,7 @@ public final class space/kscience/dataforge/meta/MetaKt {
 	public static final fun getLong (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Long;
 	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/NameToken;)Lspace/kscience/dataforge/meta/Meta;
 	public static final fun getNumber (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Number;
+	public static final fun getSelf (Lspace/kscience/dataforge/meta/TypedMeta;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public static final fun getShort (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Short;
 	public static final fun getString (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/String;
 	public static final fun getStringList (Lspace/kscience/dataforge/meta/Meta;)Ljava/util/List;
@ -312,16 +311,6 @@ public abstract interface class space/kscience/dataforge/meta/MetaProvider : spa
 	public fun getValue (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Value;
 }

-public abstract interface class space/kscience/dataforge/meta/MetaReader : space/kscience/dataforge/meta/descriptors/Described {
-	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-}
-
-public final class space/kscience/dataforge/meta/MetaReaderKt {
-	public static final fun readNullable (Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public static final fun readValue (Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
-}
-
 public abstract interface class space/kscience/dataforge/meta/MetaRepr {
 	public abstract fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }
@ -335,6 +324,16 @@ public final class space/kscience/dataforge/meta/MetaSerializer : kotlinx/serial
 	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/Meta;)V
 }

+public abstract interface class space/kscience/dataforge/meta/MetaSpec : space/kscience/dataforge/meta/descriptors/Described {
+	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+}
+
+public final class space/kscience/dataforge/meta/MetaSpecKt {
+	public static final fun readNullable (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public static final fun readValue (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
+}
+
 public final class space/kscience/dataforge/meta/MetaTransformation {
 	public static final field Companion Lspace/kscience/dataforge/meta/MetaTransformation$Companion;
 	public static final fun apply-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
@ -552,8 +551,6 @@ public abstract interface class space/kscience/dataforge/meta/ObservableMutableM
 	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public fun getSelf ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 }

 public final class space/kscience/dataforge/meta/RegexItemTransformationRule : space/kscience/dataforge/meta/TransformationRule {
@ -627,21 +624,19 @@ public final class space/kscience/dataforge/meta/SealedMeta : space/kscience/dat
 	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getItems ()Ljava/util/Map;
-	public fun getSelf ()Lspace/kscience/dataforge/meta/SealedMeta;
-	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
 }

-public synthetic class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public final class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/meta/SealedMeta$$serializer;
-	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/SealedMeta;
-	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/SealedMeta;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/SealedMeta;)V
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/SealedMeta;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }

@ -715,7 +710,6 @@ public abstract interface class space/kscience/dataforge/meta/TypedMeta : space/
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public abstract fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }

@ -850,14 +844,14 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor {
 	public fun toString ()Ljava/lang/String;
 }

-public synthetic class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer;
-	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }

@ -882,7 +876,6 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun getMultiple ()Z
 	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
-	public final fun node (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
 	public final fun setAllowedValues (Ljava/util/List;)V
 	public final fun setAttributes (Lspace/kscience/dataforge/meta/MutableMeta;)V
 	public final fun setChildren (Ljava/util/Map;)V
@ -934,6 +927,10 @@ public final class space/kscience/dataforge/meta/descriptors/ValueRestriction$Co
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }

+public final class space/kscience/dataforge/misc/CastJvmKt {
+	public static final fun unsafeCast (Ljava/lang/Object;)Ljava/lang/Object;
+}
+
 public abstract interface annotation class space/kscience/dataforge/misc/DFBuilder : java/lang/annotation/Annotation {
 }

--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Laminate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Laminate.kt
@ -9,8 +9,6 @@ import space.kscience.dataforge.names.NameToken
 */
 public class Laminate internal constructor(public val layers: List<Meta>) : TypedMeta<Laminate> {

-    override val self: Laminate get() = this
-
    override val value: Value? = layers.firstNotNullOfOrNull { it.value }

    override val items: Map<NameToken, Laminate> by lazy {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
@ -3,6 +3,7 @@ package space.kscience.dataforge.meta
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import space.kscience.dataforge.misc.DfType
+import space.kscience.dataforge.misc.unsafeCast
 import space.kscience.dataforge.names.*
 import kotlin.jvm.JvmName

@ -150,8 +151,6 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {

    override val items: Map<NameToken, M>

-    public val self: M
-
    override fun get(name: Name): M? {
        tailrec fun M.find(name: Name): M? = if (name.isEmpty()) {
            this
@ -165,6 +164,11 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {
    override fun toMeta(): Meta = this
 }

+/**
+ * Access self as a recursive type instance
+ */
+public inline val <M : TypedMeta<M>> TypedMeta<M>.self: M get() = unsafeCast()
+
 //public typealias Meta = TypedMeta<*>

 public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(token: NameToken): M? = this?.items?.get(token)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaConverter.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaConverter.kt
@ -11,7 +11,7 @@ import space.kscience.dataforge.misc.DFExperimental
 /**
 * A converter of generic object to and from [Meta]
 */
-public interface MetaConverter<T>: MetaReader<T> {
+public interface MetaConverter<T>: MetaSpec<T> {

    /**
     * A descriptor for resulting meta
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt
@ -25,16 +25,16 @@ public fun MetaProvider.node(
 }

 /**
- * Use [metaReader] to read the Meta node
+ * Use [metaSpec] to read the Meta node
 */
 public fun <T> MetaProvider.spec(
-    metaReader: MetaReader<T>,
+    metaSpec: MetaSpec<T>,
    key: Name? = null,
 ): MetaDelegate<T?> = object : MetaDelegate<T?> {
-    override val descriptor: MetaDescriptor? get() = metaReader.descriptor
+    override val descriptor: MetaDescriptor? get() = metaSpec.descriptor

    override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
-        return get(key ?: property.name.asName())?.let { metaReader.read(it) }
+        return get(key ?: property.name.asName())?.let { metaSpec.read(it) }
    }
 }

@ -50,14 +50,14 @@ public inline fun <reified T> MetaProvider.serializable(
@Deprecated("Use convertable", ReplaceWith("convertable(converter, key)"))
 public fun <T> MetaProvider.node(
    key: Name? = null,
-    converter: MetaReader<T>,
+    converter: MetaSpec<T>,
 ): ReadOnlyProperty<Any?, T?> = spec(converter, key)

 /**
 * Use [converter] to convert a list of same name siblings meta to object
 */
 public fun <T> Meta.listOfSpec(
-    converter: MetaReader<T>,
+    converter: MetaSpec<T>,
    key: Name? = null,
 ): MetaDelegate<List<T>> = object : MetaDelegate<List<T>> {
    override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaRef.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaRef.kt
@ -1,64 +0,0 @@
-package space.kscience.dataforge.meta
-
-import space.kscience.dataforge.meta.descriptors.Described
-import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
-import space.kscience.dataforge.misc.DFExperimental
-import space.kscience.dataforge.names.Name
-import space.kscience.dataforge.names.asName
-import kotlin.properties.PropertyDelegateProvider
-import kotlin.properties.ReadOnlyProperty
-
-
-/**
- * A reference to a read-only value of type [T] inside [MetaProvider]
- */
-@DFExperimental
-public data class MetaRef<T>(
-    public val name: Name,
-    public val converter: MetaConverter<T>,
-    override val descriptor: MetaDescriptor? = converter.descriptor,
-) : Described
-
-@DFExperimental
-public operator fun <T> MetaProvider.get(ref: MetaRef<T>): T? = get(ref.name)?.let { ref.converter.readOrNull(it) }
-
-@DFExperimental
-public operator fun <T> MutableMetaProvider.set(ref: MetaRef<T>, value: T) {
-    set(ref.name, ref.converter.convert(value))
-}
-
-@DFExperimental
-public class MetaSpec(
-    private val configuration: MetaDescriptorBuilder.() -> Unit = {},
-) : Described {
-    private val refs: MutableList<MetaRef<*>> = mutableListOf()
-
-    private fun registerRef(ref: MetaRef<*>) {
-        refs.add(ref)
-    }
-
-    public fun <T> item(
-        converter: MetaConverter<T>,
-        descriptor: MetaDescriptor? = converter.descriptor,
-        key: Name? = null,
-    ): PropertyDelegateProvider<MetaSpec, ReadOnlyProperty<MetaSpec, MetaRef<T>>> =
-        PropertyDelegateProvider { _, property ->
-            val ref = MetaRef(key ?: property.name.asName(), converter, descriptor)
-            registerRef(ref)
-            ReadOnlyProperty { _, _ ->
-                ref
-            }
-        }
-
-    override val descriptor: MetaDescriptor by lazy {
-        MetaDescriptor {
-            refs.forEach { ref ->
-                ref.descriptor?.let {
-                    node(ref.name, ref.descriptor)
-                }
-            }
-            configuration()
-        }
-    }
-}
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaReader.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaReader.kt
@ -2,7 +2,7 @@ package space.kscience.dataforge.meta

 import space.kscience.dataforge.meta.descriptors.Described

-public interface MetaReader<out T> : Described {
+public interface MetaSpec<out T> : Described {

    /**
     * Read the source meta into an object and return null if Meta could not be interpreted as a target type
@ -10,12 +10,12 @@ public interface MetaReader<out T> : Described {
    public fun readOrNull(source: Meta): T?

    /**
-     * Read generic read-only meta with this [MetaReader] producing instance of the desired type.
+     * Read generic read-only meta with this [MetaSpec] producing instance of the desired type.
     * Throws an error if conversion could not be done.
     */
    public fun read(source: Meta): T = readOrNull(source) ?: error("Meta $source could not be interpreted by $this")
 }


-public fun <T : Any> MetaReader<T>.readNullable(item: Meta?): T? = item?.let { read(it) }
-public fun <T> MetaReader<T>.readValue(value: Value): T? = read(Meta(value))
+public fun <T : Any> MetaSpec<T>.readNullable(item: Meta?): T? = item?.let { read(it) }
+public fun <T> MetaSpec<T>.readValue(value: Value): T? = read(Meta(value))
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
@ -253,9 +253,6 @@ private class MutableMetaImpl(
    value: Value?,
    children: Map<NameToken, Meta> = emptyMap(),
 ) : AbstractObservableMeta(), ObservableMutableMeta {
-
-    override val self get() = this
-
    override var value = value
        @ThreadSafe set(value) {
            val oldValue = field
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt
@ -39,9 +39,6 @@ public interface ObservableMeta : Meta {
 * A [Meta] which is both observable and mutable
 */
 public interface ObservableMutableMeta : ObservableMeta, MutableMeta, MutableTypedMeta<ObservableMutableMeta> {
-
-    override val self: ObservableMutableMeta get() = this
-
    override fun getOrCreate(name: Name): ObservableMutableMeta

    override fun get(name: Name): ObservableMutableMeta? {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
@ -14,9 +14,6 @@ private class ObservableMetaWrapper(
    val nodeName: Name,
    val listeners: MutableSet<MetaListener>,
 ) : ObservableMutableMeta {
-
-    override val self get() = this
-
    override val items: Map<NameToken, ObservableMutableMeta>
        get() = root[nodeName]?.items?.keys?.associateWith {
            ObservableMetaWrapper(root, nodeName + it, listeners)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt
@ -12,7 +12,7 @@ import kotlin.reflect.KProperty
 import kotlin.reflect.KProperty1

 /**
- * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [MetaReader].
+ * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [MetaSpec].
 *
 * @param prototype default values provided by this scheme
 */
@ -80,9 +80,6 @@ public open class Scheme(
    override fun toString(): String = meta.toString()

    private inner class SchemeMeta(val pathName: Name) : ObservableMutableMeta {
-
-        override val self get() = this
-
        override var value: Value?
            get() = target[pathName]?.value
                ?: prototype?.get(pathName)?.value
@ -219,7 +216,7 @@ public fun <T : Scheme> Configurable.updateWith(


 /**
- * A delegate that uses a [MetaReader] to wrap a child of this provider
+ * A delegate that uses a [MetaSpec] to wrap a child of this provider
 */
 public fun <T : Scheme> MutableMeta.scheme(
    spec: SchemeSpec<T>,
@ -242,7 +239,7 @@ public fun <T : Scheme> Scheme.scheme(
 ): ReadWriteProperty<Any?, T> = meta.scheme(spec, key)

 /**
- * A delegate that uses a [MetaReader] to wrap a child of this provider.
+ * A delegate that uses a [MetaSpec] to wrap a child of this provider.
 * Returns null if meta with given name does not exist.
 */
 public fun <T : Scheme> MutableMeta.schemeOrNull(
@ -267,7 +264,7 @@ public fun <T : Scheme> Scheme.schemeOrNull(
 ): ReadWriteProperty<Any?, T?> = meta.schemeOrNull(spec, key)

 /**
- * A delegate that uses a [MetaReader] to wrap a list of child providers.
+ * A delegate that uses a [MetaSpec] to wrap a list of child providers.
 * If children are mutable, the changes in list elements are reflected on them.
 * The list is a snapshot of children state, so change in structure is not reflected on its composition.
 */
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
@ -13,9 +13,6 @@ public class SealedMeta(
    override val value: Value?,
    override val items: Map<NameToken, SealedMeta>,
 ) : TypedMeta<SealedMeta> {
-
-    override val self: SealedMeta get() = this
-
    override fun toString(): String = Meta.toString(this)
    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)

--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt
@ -58,7 +58,7 @@ public class MetaDescriptorBuilder @PublishedApi internal constructor() {
        }
    }

-    public fun node(
+    internal fun node(
        name: Name,
        descriptorBuilder: MetaDescriptor,
    ): Unit {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/misc/cast.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/misc/cast.kt
@ -0,0 +1,3 @@
+package space.kscience.dataforge.misc
+
+public expect inline fun <T> Any?.unsafeCast(): T
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt
@ -58,7 +58,7 @@ public class Name(public val tokens: List<NameToken>) {
         */
        public fun parse(string: String): Name {
            if (string.isBlank()) return EMPTY
-            val tokens = buildList<NameToken> {
+            val tokens = sequence {
                var bodyBuilder = StringBuilder()
                var queryBuilder = StringBuilder()
                var bracketCount = 0
@ -91,7 +91,7 @@ public class Name(public val tokens: List<NameToken>) {
                        else -> when (it) {
                            '.' -> {
                                val query = if (queryBuilder.isEmpty()) null else queryBuilder.toString()
-                                add(NameToken(bodyBuilder.toString(), query))
+                                yield(NameToken(bodyBuilder.toString(), query))
                                bodyBuilder = StringBuilder()
                                queryBuilder = StringBuilder()
                            }
@ -106,9 +106,9 @@ public class Name(public val tokens: List<NameToken>) {
                    }
                }
                val query = if (queryBuilder.isEmpty()) null else queryBuilder.toString()
-                add(NameToken(bodyBuilder.toString(), query))
+                yield(NameToken(bodyBuilder.toString(), query))
            }
-            return Name(tokens)
+            return Name(tokens.toList())
        }
    }
 }
--- a/dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/meta/DynamicMeta.kt
+++ b/dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/meta/DynamicMeta.kt
@ -31,9 +31,6 @@ public fun Meta.toDynamic(): dynamic {
 }

 public class DynamicMeta(internal val obj: dynamic) : TypedMeta<DynamicMeta> {
-
-    override val self: DynamicMeta get() = this
-
    private fun keys(): Array<String> = js("Object").keys(obj) as Array<String>

    private fun isArray(obj: dynamic): Boolean =
--- a/dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/misc/castJs.kt
+++ b/dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/misc/castJs.kt
@ -0,0 +1,5 @@
+package space.kscience.dataforge.misc
+import kotlin.js.unsafeCast as unsafeCastJs
+
+@Suppress("NOTHING_TO_INLINE")
+public actual inline fun <T> Any?.unsafeCast(): T = unsafeCastJs<T>()
--- a/dataforge-meta/src/jvmMain/kotlin/space/kscience/dataforge/misc/castJvm.kt
+++ b/dataforge-meta/src/jvmMain/kotlin/space/kscience/dataforge/misc/castJvm.kt
@ -0,0 +1,4 @@
+package space.kscience.dataforge.misc
+
+@Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE")
+public actual inline fun <T> Any?.unsafeCast(): T = this as T
--- a/dataforge-meta/src/nativeMain/kotlin/space/kscience/dataforge/misc/castNative.kt
+++ b/dataforge-meta/src/nativeMain/kotlin/space/kscience/dataforge/misc/castNative.kt
@ -0,0 +1,4 @@
+package space.kscience.dataforge.misc
+
+@Suppress("UNCHECKED_CAST")
+public actual inline fun <T> Any?.unsafeCast(): T = this as T
--- a/dataforge-meta/src/wasmJsMain/kotlin/space/kscience/dataforge/misc/castWasm.kt
+++ b/dataforge-meta/src/wasmJsMain/kotlin/space/kscience/dataforge/misc/castWasm.kt
@ -0,0 +1,4 @@
+package space.kscience.dataforge.misc
+
+@Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE")
+public actual inline fun <T> Any?.unsafeCast(): T = this as T
--- a/dataforge-scripting/README.md
+++ b/dataforge-scripting/README.md
@ -6,7 +6,7 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-scripting:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-scripting:0.8.2")
 }
 ```
--- a/dataforge-workspace/README.md
+++ b/dataforge-workspace/README.md
@ -6,7 +6,7 @@

 ## Artifact:

-The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.9.0-dev-1`.
+The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.8.2`.

 **Gradle Kotlin DSL:**
 ```kotlin
@ -16,6 +16,6 @@ repositories {
 }

 dependencies {
-    implementation("space.kscience:dataforge-workspace:0.9.0-dev-1")
+    implementation("space.kscience:dataforge-workspace:0.8.2")
 }
 ```
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt
@ -5,8 +5,8 @@ import space.kscience.dataforge.data.DataSink
 import space.kscience.dataforge.data.GoalExecutionRestriction
 import space.kscience.dataforge.data.MutableDataTree
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaReader
 import space.kscience.dataforge.meta.MetaRepr
+import space.kscience.dataforge.meta.MetaSpec
 import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DfType
@ -44,10 +44,10 @@ public interface Task<T> : Described {
 }

 /**
- * A [Task] with [MetaReader] for wrapping and unwrapping task configuration
+ * A [Task] with [MetaSpec] for wrapping and unwrapping task configuration
 */
 public interface TaskWithSpec<T, C : Any> : Task<T> {
-    public val spec: MetaReader<C>
+    public val spec: MetaSpec<C>
    override val descriptor: MetaDescriptor? get() = spec.descriptor

    public suspend fun execute(workspace: Workspace, taskName: Name, configuration: C): TaskResult<T>
@ -122,10 +122,10 @@ public inline fun <reified T : Any> Task(
@Suppress("FunctionName")
 public fun <T : Any, C : MetaRepr> Task(
    resultType: KType,
-    specification: MetaReader<C>,
+    specification: MetaSpec<C>,
    builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): TaskWithSpec<T, C> = object : TaskWithSpec<T, C> {
-    override val spec: MetaReader<C> = specification
+    override val spec: MetaSpec<C> = specification

    override suspend fun execute(
        workspace: Workspace,
@ -143,6 +143,6 @@ public fun <T : Any, C : MetaRepr> Task(
 }

 public inline fun <reified T : Any, C : MetaRepr> Task(
-    specification: MetaReader<C>,
+    specification: MetaSpec<C>,
    noinline builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): Task<T> = Task(typeOf<T>(), specification, builder)
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt
@ -71,10 +71,10 @@ public inline fun <reified T : Any> TaskContainer.task(
 }

 /**
- * Create a task based on [MetaReader]
+ * Create a task based on [MetaSpec]
 */
 public inline fun <reified T : Any, C : MetaRepr> TaskContainer.task(
-    specification: MetaReader<C>,
+    specification: MetaSpec<C>,
    noinline builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): PropertyDelegateProvider<Any?, ReadOnlyProperty<Any?, TaskReference<T>>> = PropertyDelegateProvider { _, property ->
    val taskName = Name.parse(property.name)
--- a/gradle.properties
+++ b/gradle.properties
@ -1,9 +1,10 @@
-kotlin.code.style=official
-
 org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx4096m

+kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
+kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true

-toolsVersion=0.15.4-kotlin-2.0.0
+toolsVersion=0.15.2-kotlin-1.9.21
+#kotlin.experimental.tryK2=true