diff --git a/README.md b/README.md
index d47016a2a..586d2185f 100644
--- a/README.md
+++ b/README.md
@@ -257,8 +257,8 @@ repositories {
 }
 
 dependencies {
-    api("kscience.kmath:kmath-core:0.2.0-dev-6")
-    // api("kscience.kmath:kmath-core-jvm:0.2.0-dev-6") for jvm-specific version
+    api("kscience.kmath:kmath-core:0.2.0-dev-7")
+    // api("kscience.kmath:kmath-core-jvm:0.2.0-dev-7") for jvm-specific version
 }
 ```
 
diff --git a/kmath-ast/README.md b/kmath-ast/README.md
index 8499f7171..c54c4afb1 100644
--- a/kmath-ast/README.md
+++ b/kmath-ast/README.md
@@ -12,7 +12,7 @@ This subproject implements the following features:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-ast:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-ast:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-ast/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-ast/_latestVersion)
 >
@@ -30,7 +30,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-ast:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-ast:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -44,7 +44,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-ast:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-ast:0.2.0-dev-7")
 > }
 > ```
 
@@ -75,7 +75,7 @@ import kscience.kmath.expressions.Symbol;
 public final class AsmCompiledExpression_45045_0 implements Expression<Double> {
     private final Object[] constants;
 
-    public final Double invoke(Map<Symbol, Double> arguments) {
+    public final Double invoke(Map<Symbol, ? extends Double> arguments) {
         return (Double)((Function2)this.constants[0]).invoke((Double)MapIntrinsics.getOrFail(arguments, "x"), 2);
     }
 
diff --git a/kmath-ast/docs/README-TEMPLATE.md b/kmath-ast/docs/README-TEMPLATE.md
index 3227a2ad3..ebaa6246a 100644
--- a/kmath-ast/docs/README-TEMPLATE.md
+++ b/kmath-ast/docs/README-TEMPLATE.md
@@ -33,7 +33,7 @@ import kscience.kmath.expressions.Symbol;
 public final class AsmCompiledExpression_45045_0 implements Expression<Double> {
     private final Object[] constants;
 
-    public final Double invoke(Map<Symbol, Double> arguments) {
+    public final Double invoke(Map<Symbol, ? extends Double> arguments) {
         return (Double)((Function2)this.constants[0]).invoke((Double)MapIntrinsics.getOrFail(arguments, "x"), 2);
     }
 
diff --git a/kmath-ast/src/jvmMain/kotlin/kscience/kmath/asm/internal/AsmBuilder.kt b/kmath-ast/src/jvmMain/kotlin/kscience/kmath/asm/internal/AsmBuilder.kt
index 93d8d1143..cd1236b70 100644
--- a/kmath-ast/src/jvmMain/kotlin/kscience/kmath/asm/internal/AsmBuilder.kt
+++ b/kmath-ast/src/jvmMain/kotlin/kscience/kmath/asm/internal/AsmBuilder.kt
@@ -83,7 +83,7 @@ internal class AsmBuilder<T>(
                 ACC_PUBLIC or ACC_FINAL,
                 "invoke",
                 getMethodDescriptor(tType, MAP_TYPE),
-                "(L${MAP_TYPE.internalName}<${SYMBOL_TYPE.descriptor}${if (Modifier.isFinal(classOfT.modifiers)) "" else "+"}${tType.descriptor}>;)${tType.descriptor}",
+                "(L${MAP_TYPE.internalName}<${SYMBOL_TYPE.descriptor}+${tType.descriptor}>;)${tType.descriptor}",
                 null,
             ).instructionAdapter {
                 invokeMethodVisitor = this
diff --git a/kmath-complex/README.md b/kmath-complex/README.md
index eecb6b205..8e5320225 100644
--- a/kmath-complex/README.md
+++ b/kmath-complex/README.md
@@ -8,7 +8,7 @@ Complex and hypercomplex number systems in KMath:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-complex:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-complex:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-complex/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-complex/_latestVersion)
 >
@@ -26,7 +26,7 @@ Complex and hypercomplex number systems in KMath:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-complex:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-complex:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -40,6 +40,6 @@ Complex and hypercomplex number systems in KMath:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-complex:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-complex:0.2.0-dev-7")
 > }
 > ```
diff --git a/kmath-core/README.md b/kmath-core/README.md
index 504171fe2..a38b3acaa 100644
--- a/kmath-core/README.md
+++ b/kmath-core/README.md
@@ -15,7 +15,7 @@ performance calculations to code generation.
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-core:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-core:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-core/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-core/_latestVersion)
 >
@@ -33,7 +33,7 @@ performance calculations to code generation.
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-core:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-core:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -47,6 +47,6 @@ performance calculations to code generation.
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-core:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-core:0.2.0-dev-7")
 > }
 > ```
diff --git a/kmath-for-real/README.md b/kmath-for-real/README.md
index 9b191121d..c291be3a1 100644
--- a/kmath-for-real/README.md
+++ b/kmath-for-real/README.md
@@ -7,7 +7,7 @@
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-for-real:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-for-real:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-for-real/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-for-real/_latestVersion)
 >
@@ -25,7 +25,7 @@
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-for-real:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-for-real:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -39,6 +39,6 @@
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-for-real:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-for-real:0.2.0-dev-7")
 > }
 > ```
diff --git a/kmath-functions/README.md b/kmath-functions/README.md
index 3e3d96fe9..f5462e09f 100644
--- a/kmath-functions/README.md
+++ b/kmath-functions/README.md
@@ -10,7 +10,7 @@ Functions and interpolations:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-functions:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-functions:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-functions/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-functions/_latestVersion)
 >
@@ -28,7 +28,7 @@ Functions and interpolations:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-functions:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-functions:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -42,6 +42,6 @@ Functions and interpolations:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-functions:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-functions:0.2.0-dev-7")
 > }
 > ```
diff --git a/kmath-nd4j/README.md b/kmath-nd4j/README.md
index 5ef42bab3..9011ef3c5 100644
--- a/kmath-nd4j/README.md
+++ b/kmath-nd4j/README.md
@@ -9,7 +9,7 @@ This subproject implements the following features:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-nd4j:0.2.0-dev-6`.
+> This module artifact: `kscience.kmath:kmath-nd4j:0.2.0-dev-7`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-nd4j/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-nd4j/_latestVersion)
 >
@@ -27,7 +27,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-nd4j:0.2.0-dev-6'
+>     implementation 'kscience.kmath:kmath-nd4j:0.2.0-dev-7'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -41,7 +41,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-nd4j:0.2.0-dev-6")
+>     implementation("kscience.kmath:kmath-nd4j:0.2.0-dev-7")
 > }
 > ```