diff --git a/dataforge-io/src/commonTest/kotlin/hep/dataforge/io/MetaSerializerTest.kt b/dataforge-io/src/commonTest/kotlin/hep/dataforge/io/MetaSerializerTest.kt
index 69b0427b..86a569a6 100644
--- a/dataforge-io/src/commonTest/kotlin/hep/dataforge/io/MetaSerializerTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/hep/dataforge/io/MetaSerializerTest.kt
@@ -11,17 +11,17 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 
 class MetaSerializerTest {
+    val meta = Meta {
+        "a" put 22
+        "node" put {
+            "b" put "DDD"
+            "c" put 11.1
+            "array" put doubleArrayOf(1.0, 2.0, 3.0)
+        }
+    }
+
     @Test
     fun testMetaSerialization() {
-        val meta = Meta {
-            "a" put 22
-            "node" put {
-                "b" put "DDD"
-                "c" put 11.1
-                "array" put doubleArrayOf(1.0, 2.0, 3.0)
-            }
-        }
-
         val string = Json.indented.stringify(MetaSerializer, meta)
         val restored = Json.plain.parse(MetaSerializer, string)
         assertEquals(restored, meta)
@@ -29,15 +29,6 @@ class MetaSerializerTest {
 
     @Test
     fun testCborSerialization() {
-        val meta = Meta {
-            "a" put 22
-            "node" put {
-                "b" put "DDD"
-                "c" put 11.1
-                "array" put doubleArrayOf(1.0, 2.0, 3.0)
-            }
-        }
-
         val bytes = Cbor.dump(MetaSerializer, meta)
         println(bytes.contentToString())
         val restored = Cbor.load(MetaSerializer, bytes)
diff --git a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/fileIO.kt b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/fileIO.kt
index 1fe9d59d..c9b4f1bf 100644
--- a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/fileIO.kt
+++ b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/fileIO.kt
@@ -1,9 +1,9 @@
 package hep.dataforge.io
 
-import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.meta.DFExperimental
 import hep.dataforge.meta.EmptyMeta
 import hep.dataforge.meta.Meta
+import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.meta.isEmpty
 import kotlinx.io.*
 import java.nio.file.Files
@@ -14,6 +14,7 @@ import kotlin.streams.asSequence
 /**
  * Resolve IOFormat based on type
  */
+@Suppress("UNCHECKED_CAST")
 @DFExperimental
 inline fun <reified T : Any> IOPlugin.resolveIOFormat(): IOFormat<T>? {
     return ioFormats.values.find { it.type.isSuperclassOf(T::class) } as IOFormat<T>?
diff --git a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/functionsJVM.kt b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/functionsJVM.kt
index fae986d7..ffb924ef 100644
--- a/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/functionsJVM.kt
+++ b/dataforge-io/src/jvmMain/kotlin/hep/dataforge/io/functionsJVM.kt
@@ -3,7 +3,6 @@ package hep.dataforge.io
 import hep.dataforge.io.functions.FunctionServer
 import hep.dataforge.io.functions.function
 import hep.dataforge.meta.Meta
-import hep.dataforge.meta.buildMeta
 import hep.dataforge.names.Name
 import kotlin.reflect.KClass
 import kotlin.reflect.full.isSuperclassOf
@@ -14,7 +13,7 @@ fun IOPlugin.resolveIOFormatName(type: KClass<*>): Name {
         ?: error("Can't resolve IOFormat for type $type")
 }
 
-inline fun <reified T : Any, reified R : Any> IOPlugin.generateFunctionMeta(functionName: String): Meta = buildMeta {
+inline fun <reified T : Any, reified R : Any> IOPlugin.generateFunctionMeta(functionName: String): Meta = Meta {
     FunctionServer.FUNCTION_NAME_KEY put functionName
     FunctionServer.INPUT_FORMAT_KEY put resolveIOFormatName(T::class).toString()
     FunctionServer.OUTPUT_FORMAT_KEY put resolveIOFormatName(R::class).toString()
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Config.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Config.kt
index 833117b5..53a2e184 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Config.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Config.kt
@@ -4,6 +4,7 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.NameToken
 import hep.dataforge.names.asName
 import hep.dataforge.names.plus
+import kotlinx.serialization.*
 
 //TODO add validator to configuration
 
@@ -20,6 +21,7 @@ interface ObservableMeta : Meta {
 /**
  * Mutable meta representing object state
  */
+@Serializable
 class Config : AbstractMutableMeta<Config>(), ObservableMeta {
 
     private val listeners = HashSet<MetaListener>()
@@ -66,8 +68,19 @@ class Config : AbstractMutableMeta<Config>(), ObservableMeta {
 
     override fun empty(): Config = Config()
 
-    companion object {
+    @Serializer(Config::class)
+    companion object ConfigSerializer : KSerializer<Config> {
+
         fun empty(): Config = Config()
+        override val descriptor: SerialDescriptor get() = MetaSerializer.descriptor
+
+        override fun deserialize(decoder: Decoder): Config {
+            return MetaSerializer.deserialize(decoder).asConfig()
+        }
+
+        override fun serialize(encoder: Encoder, value: Config) {
+            MetaSerializer.serialize(encoder, value)
+        }
     }
 }
 
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
index e5cda8f6..672a1922 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
@@ -15,6 +15,7 @@ import kotlinx.serialization.*
  */
 @Serializable
 sealed class MetaItem<out M : Meta> {
+
     @Serializable
     data class ValueItem(val value: Value) : MetaItem<Nothing>() {
         override fun toString(): String = value.toString()
@@ -32,12 +33,13 @@ sealed class MetaItem<out M : Meta> {
     }
 
     @Serializable
-    data class NodeItem<M : Meta>(val node: M) : MetaItem<M>() {
+    data class NodeItem<M : Meta>(@Serializable(MetaSerializer::class) val node: M) : MetaItem<M>() {
+        //Fixing serializer for node could cause class cast problems, but it should not since Meta descendants are not serializeable
         override fun toString(): String = node.toString()
 
         @Serializer(NodeItem::class)
-        companion object : KSerializer<NodeItem<*>> {
-            override val descriptor: SerialDescriptor get() = ValueSerializer.descriptor
+        companion object : KSerializer<NodeItem<out Meta>> {
+            override val descriptor: SerialDescriptor get() = MetaSerializer.descriptor
 
             override fun deserialize(decoder: Decoder): NodeItem<*> = NodeItem(MetaSerializer.deserialize(decoder))
 
@@ -199,8 +201,9 @@ abstract class AbstractMetaNode<M : MetaNode<M>> : MetaNode<M>, MetaBase()
  *
  * If the argument is possibly mutable node, it is copied on creation
  */
-class SealedMeta internal constructor(override val items: Map<NameToken, MetaItem<SealedMeta>>) :
-    AbstractMetaNode<SealedMeta>()
+class SealedMeta internal constructor(
+    override val items: Map<NameToken, MetaItem<SealedMeta>>
+) : AbstractMetaNode<SealedMeta>()
 
 /**
  * Generate sealed node from [this]. If it is already sealed return it as is
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
index 63a45664..6f0db59e 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
@@ -8,8 +8,6 @@ import kotlinx.serialization.json.JsonObjectSerializer
 import kotlinx.serialization.json.JsonOutput
 
 
-private class DeserializedMeta(override val items: Map<NameToken, MetaItem<Meta>>) : MetaBase()
-
 /**
  * Serialized for meta
  */
@@ -26,7 +24,9 @@ object MetaSerializer : KSerializer<Meta> {
         return if (decoder is JsonInput) {
             JsonObjectSerializer.deserialize(decoder).toMeta()
         } else {
-            DeserializedMeta(mapSerializer.deserialize(decoder))
+            object : MetaBase() {
+                override val items: Map<NameToken, MetaItem<*>> = mapSerializer.deserialize(decoder)
+            }
         }
     }
 
@@ -37,17 +37,4 @@ object MetaSerializer : KSerializer<Meta> {
             mapSerializer.serialize(encoder, value.items)
         }
     }
-}
-
-@Serializer(Config::class)
-object ConfigSerializer : KSerializer<Config> {
-    override val descriptor: SerialDescriptor get() = MetaSerializer.descriptor
-
-    override fun deserialize(decoder: Decoder): Config {
-        return MetaSerializer.deserialize(decoder).asConfig()
-    }
-
-    override fun serialize(encoder: Encoder, value: Config) {
-        MetaSerializer.serialize(encoder, value)
-    }
 }
\ No newline at end of file
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/scheme/ConfigurableDelegate.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/scheme/ConfigurableDelegate.kt
index da02c30e..da6d92a8 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/scheme/ConfigurableDelegate.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/scheme/ConfigurableDelegate.kt
@@ -168,8 +168,9 @@ fun Configurable.float(default: Float, key: Name? = null): ReadWriteProperty<Any
 /**
  * Enum delegate
  */
-inline fun <reified E : Enum<E>> Configurable.enum(default: E, key: Name? = null): ReadWriteProperty<Any?, E> =
-    item(default, key).transform { it.enum<E>() ?: default }
+inline fun <reified E : Enum<E>> Configurable.enum(default: E, key: Name? = null): ReadWriteProperty<Any?, E> {
+    return item(default, key).transform { it.enum<E>() ?: default }
+}
 
 /*
  * Extra delegates for special cases
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index cc4fdc29..f3d88b1c 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 6ce793f2..a2bf1313 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.2.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew.bat b/gradlew.bat
index 9618d8d9..62bd9b9c 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -29,6 +29,9 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"