Relaxed type restriction on MetaConverter

CHANGELOG.md

@@ -8,6 +8,7 @@
 - **API breaking** Descriptor no has a member property `defaultValue` instead of `defaultItem()` extension. It caches default value state on the first call. It is done because computing default on each call is too expensive.
 - Kotlin 1.5.10
 - Build tools 0.10.0
+- Relaxed type restriction on `MetaConverter`. Now nullables are available.
 
 ### Deprecated
 

build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.4.3"
+    version = "0.4.4-dev-1"
 }
 
 subprojects {

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaConverter.kt

@@ -6,7 +6,7 @@ import space.kscience.dataforge.values.*
 /**
  * A converter of generic object to and from [TypedMetaItem]
  */
-public interface MetaConverter<T : Any> {
+public interface MetaConverter<T> {
     public fun itemToObject(item: MetaItem): T
     public fun objectToMetaItem(obj: T): MetaItem
 
@@ -120,5 +120,5 @@ public interface MetaConverter<T : Any> {
 public fun <T : Any> MetaConverter<T>.nullableItemToObject(item: MetaItem?): T? = item?.let { itemToObject(it) }
 public fun <T : Any> MetaConverter<T>.nullableObjectToMetaItem(obj: T?): MetaItem? = obj?.let { objectToMetaItem(it) }
 
-public fun <T : Any> MetaConverter<T>.metaToObject(meta: Meta): T = itemToObject(MetaItemNode(meta))
-public fun <T : Any> MetaConverter<T>.valueToObject(value: Value): T = itemToObject(MetaItemValue(value))
+public fun <T> MetaConverter<T>.metaToObject(meta: Meta): T = itemToObject(MetaItemNode(meta))
+public fun <T> MetaConverter<T>.valueToObject(value: Value): T = itemToObject(MetaItemValue(value))