diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/AbstractAction.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/AbstractAction.kt
index 1802e488..00201a90 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/AbstractAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/AbstractAction.kt
@@ -21,7 +21,7 @@ internal fun MutableMap<Name, *>.removeWhatStartsWith(name: Name) {
 /**
  * An action that caches results on-demand and recalculates them on source push
  */
-public abstract class AbstractAction<T : Any, R : Any>(
+public abstract class AbstractAction<T, R>(
     public val outputType: KType,
 ) : Action<T, R> {
 
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 fafb2d55..ffa1d93d 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
@@ -50,7 +50,7 @@ public class MapActionBuilder<T, R>(
 }
 
 @PublishedApi
-internal class MapAction<T : Any, R : Any>(
+internal class MapAction<T, R>(
     outputType: KType,
     private val block: MapActionBuilder<T, R>.() -> Unit,
 ) : AbstractAction<T, R>(outputType) {
@@ -96,7 +96,7 @@ internal class MapAction<T : Any, R : Any>(
  * A one-to-one mapping action
  */
 @DFExperimental
-public inline fun <T : Any, reified R : Any> Action.Companion.mapping(
+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/actions/ReduceAction.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/ReduceAction.kt
index 9440be55..0da9b61c 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/ReduceAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/ReduceAction.kt
@@ -12,7 +12,7 @@ import kotlin.reflect.KType
 import kotlin.reflect.typeOf
 
 
-public class JoinGroup<T : Any, R : Any>(
+public class JoinGroup<T, R>(
     public var name: String,
     internal val set: DataTree<T>,
     @PublishedApi internal var outputType: KType,
@@ -35,7 +35,7 @@ public class JoinGroup<T : Any, R : Any>(
 }
 
 @DFBuilder
-public class ReduceGroupBuilder<T : Any, R : Any>(
+public class ReduceGroupBuilder<T, R>(
     public val actionMeta: Meta,
     private val outputType: KType,
 ) {
@@ -79,7 +79,7 @@ public class ReduceGroupBuilder<T : Any, R : Any>(
 }
 
 @PublishedApi
-internal class ReduceAction<T : Any, R : Any>(
+internal class ReduceAction<T, R>(
     outputType: KType,
     private val action: ReduceGroupBuilder<T, R>.() -> Unit,
 ) : AbstractAction<T, R>(outputType) {
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/SplitAction.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/SplitAction.kt
index cacbf1ee..b2937515 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/SplitAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/actions/SplitAction.kt
@@ -13,9 +13,9 @@ import kotlin.reflect.KType
 import kotlin.reflect.typeOf
 
 
-public class SplitBuilder<T : Any, R : Any>(public val name: Name, public val meta: Meta) {
+public class SplitBuilder<T, R>(public val name: Name, public val meta: Meta) {
 
-    public class FragmentRule<T : Any, R : Any>(
+    public class FragmentRule<T, R>(
         public val name: Name,
         public var meta: MutableMeta,
         @PublishedApi internal var outputType: KType,
@@ -44,7 +44,7 @@ public class SplitBuilder<T : Any, R : Any>(public val name: Name, public val me
  * Action that splits each incoming element into a number of fragments defined in builder
  */
 @PublishedApi
-internal class SplitAction<T : Any, R : Any>(
+internal class SplitAction<T, R>(
     outputType: KType,
     private val action: SplitBuilder<T, R>.() -> Unit,
 ) : AbstractAction<T, R>(outputType) {
diff --git a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/GroupRule.kt b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/GroupRule.kt
index 90486d85..ff7c94a8 100644
--- a/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/GroupRule.kt
+++ b/dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/GroupRule.kt
@@ -20,7 +20,7 @@ import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.misc.DFInternal
 
 public interface GroupRule {
-    public fun <T : Any> gather(set: DataTree<T>): Map<String, DataTree<T>>
+    public fun <T> gather(set: DataTree<T>): Map<String, DataTree<T>>
 
     public companion object {
         /**
@@ -37,7 +37,7 @@ public interface GroupRule {
             defaultTagValue: String,
         ): GroupRule = object : GroupRule {
 
-            override fun <T : Any> gather(
+            override fun <T> gather(
                 set: DataTree<T>,
             ): Map<String, DataTree<T>> {
                 val map = HashMap<String, DataTreeBuilder<T>>()