diff --git a/extensions-compose-experimental/api/extensions-compose-experimental.klib.api b/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
index 17b79dc39..5f7c7e4d9 100644
--- a/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
+++ b/extensions-compose-experimental/api/extensions-compose-experimental.klib.api
@@ -18,7 +18,7 @@ abstract interface com.arkivanov.decompose.extensions.compose.experimental.stack
     abstract fun <#A1: kotlin/Any, #B1: kotlin/Any> provide(): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A1, #B1>? // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimationProvider.provide|provide(){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 }
 
-final class <#A: in kotlin/Any, #B: in kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams { // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams|null[0]
+final class com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams { // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams|null[0]
     constructor <init>(com.arkivanov.essenty.backhandler/BackHandler, kotlin/Function0<kotlin/Unit>, kotlin/Function1<com.arkivanov.essenty.backhandler/BackEvent, com.arkivanov.decompose.extensions.compose.stack.animation.predictiveback/PredictiveBackAnimatable?> = ...) // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams.<init>|<init>(com.arkivanov.essenty.backhandler.BackHandler;kotlin.Function0<kotlin.Unit>;kotlin.Function1<com.arkivanov.essenty.backhandler.BackEvent,com.arkivanov.decompose.extensions.compose.stack.animation.predictiveback.PredictiveBackAnimatable?>){}[0]
 
     final val animatable // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams.animatable|{}animatable[0]
@@ -36,8 +36,8 @@ final val com.arkivanov.decompose.extensions.compose.experimental.stack.animatio
 final val com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop|#static{}com_arkivanov_decompose_extensions_compose_experimental_stack_animation_PredictiveBackParams$stableprop[0]
 
 final fun (com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator).com.arkivanov.decompose.extensions.compose.experimental.stack.animation/plus(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/plus|plus@com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator){}[0]
-final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator = ..., kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams<#A, #B>?> = ...): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator;kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams<0:0,0:1>?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
-final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams<#A, #B>?> = ..., kotlin/Function3<com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose.extensions.compose.stack.animation/Direction, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator?>): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams<0:0,0:1>?>;kotlin.Function3<com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.extensions.compose.stack.animation.Direction,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
+final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator = ..., kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams?> = ...): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator;kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
+final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation(kotlin/Boolean = ..., kotlin/Function1<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/PredictiveBackParams?> = ..., kotlin/Function3<com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose/Child.Created<#A, #B>, com.arkivanov.decompose.extensions.compose.stack.animation/Direction, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimator?>): com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B> // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/stackAnimation|stackAnimation(kotlin.Boolean;kotlin.Function1<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.PredictiveBackParams?>;kotlin.Function3<com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.Child.Created<0:0,0:1>,com.arkivanov.decompose.extensions.compose.stack.animation.Direction,com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimator?>){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack(com.arkivanov.decompose.router.stack/ChildStack<#A, #B>, androidx.compose.ui/Modifier?, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B>?, kotlin/Function4<androidx.compose.animation/AnimatedVisibilityScope, com.arkivanov.decompose/Child.Created<#A, #B>, androidx.compose.runtime/Composer, kotlin/Int, kotlin/Unit>, androidx.compose.runtime/Composer?, kotlin/Int, kotlin/Int) // com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack|ChildStack(com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>;androidx.compose.ui.Modifier?;com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimation<0:0,0:1>?;kotlin.Function4<androidx.compose.animation.AnimatedVisibilityScope,com.arkivanov.decompose.Child.Created<0:0,0:1>,androidx.compose.runtime.Composer,kotlin.Int,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int;kotlin.Int){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun <#A: kotlin/Any, #B: kotlin/Any> com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack(com.arkivanov.decompose.value/Value<com.arkivanov.decompose.router.stack/ChildStack<#A, #B>>, androidx.compose.ui/Modifier?, com.arkivanov.decompose.extensions.compose.experimental.stack.animation/StackAnimation<#A, #B>?, kotlin/Function4<androidx.compose.animation/AnimatedVisibilityScope, com.arkivanov.decompose/Child.Created<#A, #B>, androidx.compose.runtime/Composer, kotlin/Int, kotlin/Unit>, androidx.compose.runtime/Composer?, kotlin/Int, kotlin/Int) // com.arkivanov.decompose.extensions.compose.experimental.stack/ChildStack|ChildStack(com.arkivanov.decompose.value.Value<com.arkivanov.decompose.router.stack.ChildStack<0:0,0:1>>;androidx.compose.ui.Modifier?;com.arkivanov.decompose.extensions.compose.experimental.stack.animation.StackAnimation<0:0,0:1>?;kotlin.Function4<androidx.compose.animation.AnimatedVisibilityScope,com.arkivanov.decompose.Child.Created<0:0,0:1>,androidx.compose.runtime.Composer,kotlin.Int,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int;kotlin.Int){0§<kotlin.Any>;1§<kotlin.Any>}[0]
 final fun com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_DefaultStackAnimation$stableprop_getter(): kotlin/Int // com.arkivanov.decompose.extensions.compose.experimental.stack.animation/com_arkivanov_decompose_extensions_compose_experimental_stack_animation_DefaultStackAnimation$stableprop_getter|com_arkivanov_decompose_extensions_compose_experimental_stack_animation_DefaultStackAnimation$stableprop_getter(){}[0]
diff --git a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/DefaultStackAnimation.kt b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/DefaultStackAnimation.kt
index 0a7484b6a..1d4b696bb 100644
--- a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/DefaultStackAnimation.kt
+++ b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/DefaultStackAnimation.kt
@@ -37,7 +37,7 @@ import kotlinx.coroutines.launch
 @ExperimentalDecomposeApi
 internal class DefaultStackAnimation<C : Any, T : Any>(
     private val disableInputDuringAnimation: Boolean,
-    private val predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams<C, T>?,
+    private val predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams?,
     private val selector: (child: Child.Created<C, T>, otherChild: Child.Created<C, T>, direction: Direction) -> StackAnimator?,
 ) : StackAnimation<C, T> {
 
@@ -175,7 +175,7 @@ internal class DefaultStackAnimation<C : Any, T : Any>(
     @Composable
     private fun PredictiveBackController(
         stack: ChildStack<C, T>,
-        predictiveBackParams: PredictiveBackParams<C, T>,
+        predictiveBackParams: PredictiveBackParams,
         setItems: (Map<Any, AnimationItem<C, T>>) -> Unit,
     ) {
         val scope = rememberCoroutineScope()
@@ -217,7 +217,7 @@ internal class DefaultStackAnimation<C : Any, T : Any>(
     private inner class PredictiveBackCallback(
         private val stack: ChildStack<C, T>,
         private val scope: CoroutineScope,
-        private val predictiveBackParams: PredictiveBackParams<C, T>,
+        private val predictiveBackParams: PredictiveBackParams,
         private val setItems: (Map<Any, AnimationItem<C, T>>) -> Unit,
     ) : BackCallback() {
         private var animationHandler: AnimationHandler? = null
diff --git a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/PredictiveBackParams.kt b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/PredictiveBackParams.kt
index b88c2bb8e..fd9e2b268 100644
--- a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/PredictiveBackParams.kt
+++ b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/PredictiveBackParams.kt
@@ -20,7 +20,7 @@ import com.arkivanov.essenty.backhandler.BackHandler
  * @see com.arkivanov.decompose.extensions.compose.stack.animation.predictiveback.androidPredictiveBackAnimatable
  */
 @ExperimentalDecomposeApi
-class PredictiveBackParams<in C : Any, in T : Any>(
+class PredictiveBackParams(
     val backHandler: BackHandler,
     val onBack: () -> Unit,
     val animatable: (initialBackEvent: BackEvent) -> PredictiveBackAnimatable? = { null },
diff --git a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
index 45b5534f7..e062272d1 100644
--- a/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
+++ b/extensions-compose-experimental/src/commonMain/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/animation/StackAnimation.kt
@@ -34,7 +34,7 @@ fun interface StackAnimation<C : Any, T : Any> {
 @ExperimentalDecomposeApi
 fun <C : Any, T : Any> stackAnimation(
     disableInputDuringAnimation: Boolean = true,
-    predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams<C, T>? = { null },
+    predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams? = { null },
     selector: (child: Child.Created<C, T>, otherChild: Child.Created<C, T>, direction: Direction) -> StackAnimator?,
 ): StackAnimation<C, T> =
     DefaultStackAnimation(
@@ -56,7 +56,7 @@ fun <C : Any, T : Any> stackAnimation(
 fun <C : Any, T : Any> stackAnimation(
     animator: StackAnimator = fade(),
     disableInputDuringAnimation: Boolean = true,
-    predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams<C, T>? = { null },
+    predictiveBackParams: (ChildStack<C, T>) -> PredictiveBackParams? = { null },
 ): StackAnimation<C, T> =
     DefaultStackAnimation(
         disableInputDuringAnimation = disableInputDuringAnimation,
diff --git a/extensions-compose-experimental/src/jvmTest/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/ChildStackTest.kt b/extensions-compose-experimental/src/jvmTest/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/ChildStackTest.kt
index 85acef553..5b8554453 100644
--- a/extensions-compose-experimental/src/jvmTest/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/ChildStackTest.kt
+++ b/extensions-compose-experimental/src/jvmTest/kotlin/com/arkivanov/decompose/extensions/compose/experimental/stack/ChildStackTest.kt
@@ -237,13 +237,13 @@ class ChildStackTest(
 
         private fun getParameters(): List<StackAnimation<Config, Config>?> {
             val predictiveBackParams1 =
-                PredictiveBackParams<Config, Config>(
+                PredictiveBackParams(
                     backHandler = BackDispatcher(),
                     onBack = {},
                 )
 
             val predictiveBackParams2 =
-                PredictiveBackParams<Config, Config>(
+                PredictiveBackParams(
                     backHandler = BackDispatcher(),
                     onBack = {},
                     animatable = ::materialPredictiveBackAnimatable,