diff --git a/build.gradle.kts b/build.gradle.kts
index a862f60c6..554f632a1 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,11 +1,11 @@
 plugins {
-    val kotlinVersion = "1.6.10"
+    val kotlinVersion = "1.6.21"
     kotlin("jvm") apply false
     kotlin("js") apply false
     kotlin("multiplatform") apply false
     kotlin("plugin.spring") version kotlinVersion apply false
     kotlin("plugin.serialization") version kotlinVersion apply false
-    id("org.jetbrains.dokka") version "1.6.10" apply false
+    id("org.jetbrains.dokka") version "1.6.20" apply false
     id("org.hildan.github.changelog") version "1.11.1"
     id("org.jetbrains.kotlinx.binary-compatibility-validator") version "0.8.0"
     `maven-publish`
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 8e705e849..a2dac667d 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -9,5 +9,5 @@ repositories {
 dependencies {
     implementation(gradleApi())
     implementation(gradleKotlinDsl())
-    implementation(kotlin("gradle-plugin", "1.6.10"))
+    implementation(kotlin("gradle-plugin", "1.6.21"))
 }
diff --git a/krossbow-stomp-core/api/krossbow-stomp-core.api b/krossbow-stomp-core/api/krossbow-stomp-core.api
index d2378dde9..5796d4bf9 100644
--- a/krossbow-stomp-core/api/krossbow-stomp-core.api
+++ b/krossbow-stomp-core/api/krossbow-stomp-core.api
@@ -499,7 +499,7 @@ public final class org/hildan/krossbow/stomp/headers/StompAbortHeaders : org/hil
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompAbortHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompAbortHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -516,7 +516,7 @@ public final class org/hildan/krossbow/stomp/headers/StompAbortHeaders : org/hil
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -540,7 +540,7 @@ public final class org/hildan/krossbow/stomp/headers/StompAckHeaders : org/hilda
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompAckHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompAckHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -558,7 +558,7 @@ public final class org/hildan/krossbow/stomp/headers/StompAckHeaders : org/hilda
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -581,7 +581,7 @@ public final class org/hildan/krossbow/stomp/headers/StompBeginHeaders : org/hil
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompBeginHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompBeginHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -598,7 +598,7 @@ public final class org/hildan/krossbow/stomp/headers/StompBeginHeaders : org/hil
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -621,7 +621,7 @@ public final class org/hildan/krossbow/stomp/headers/StompCommitHeaders : org/hi
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompCommitHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompCommitHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -638,7 +638,7 @@ public final class org/hildan/krossbow/stomp/headers/StompCommitHeaders : org/hi
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -662,7 +662,7 @@ public final class org/hildan/krossbow/stomp/headers/StompConnectHeaders : org/h
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompConnectHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompConnectHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public final fun getAcceptVersion ()Ljava/util/List;
@@ -683,7 +683,7 @@ public final class org/hildan/krossbow/stomp/headers/StompConnectHeaders : org/h
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -707,7 +707,7 @@ public final class org/hildan/krossbow/stomp/headers/StompConnectedHeaders : org
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompConnectedHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompConnectedHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -727,7 +727,7 @@ public final class org/hildan/krossbow/stomp/headers/StompConnectedHeaders : org
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -751,7 +751,7 @@ public final class org/hildan/krossbow/stomp/headers/StompDisconnectHeaders : or
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompDisconnectHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompDisconnectHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -767,7 +767,7 @@ public final class org/hildan/krossbow/stomp/headers/StompDisconnectHeaders : or
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -791,7 +791,7 @@ public final class org/hildan/krossbow/stomp/headers/StompErrorHeaders : org/hil
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompErrorHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompErrorHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -809,7 +809,7 @@ public final class org/hildan/krossbow/stomp/headers/StompErrorHeaders : org/hil
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -842,7 +842,7 @@ public final class org/hildan/krossbow/stomp/headers/StompMessageHeaders : org/h
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompMessageHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompMessageHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public final fun getAck ()Ljava/lang/String;
@@ -862,7 +862,7 @@ public final class org/hildan/krossbow/stomp/headers/StompMessageHeaders : org/h
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -886,7 +886,7 @@ public final class org/hildan/krossbow/stomp/headers/StompNackHeaders : org/hild
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompNackHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompNackHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -904,7 +904,7 @@ public final class org/hildan/krossbow/stomp/headers/StompNackHeaders : org/hild
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -927,7 +927,7 @@ public final class org/hildan/krossbow/stomp/headers/StompReceiptHeaders : org/h
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompReceiptHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompReceiptHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -944,7 +944,7 @@ public final class org/hildan/krossbow/stomp/headers/StompReceiptHeaders : org/h
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -968,7 +968,7 @@ public final class org/hildan/krossbow/stomp/headers/StompSendHeaders : org/hild
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompSendHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompSendHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -986,7 +986,7 @@ public final class org/hildan/krossbow/stomp/headers/StompSendHeaders : org/hild
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -1011,7 +1011,7 @@ public final class org/hildan/krossbow/stomp/headers/StompSubscribeHeaders : org
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompSubscribeHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompSubscribeHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public final fun getAck ()Lorg/hildan/krossbow/stomp/headers/AckMode;
@@ -1030,7 +1030,7 @@ public final class org/hildan/krossbow/stomp/headers/StompSubscribeHeaders : org
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V
@@ -1053,7 +1053,7 @@ public final class org/hildan/krossbow/stomp/headers/StompUnsubscribeHeaders : o
 	public static synthetic fun copy$default (Lorg/hildan/krossbow/stomp/headers/StompUnsubscribeHeaders;Lorg/hildan/krossbow/stomp/headers/StompHeaders;ILjava/lang/Object;)Lorg/hildan/krossbow/stomp/headers/StompUnsubscribeHeaders;
 	public final fun entrySet ()Ljava/util/Set;
 	public fun equals (Ljava/lang/Object;)Z
-	public synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun get (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun get (Ljava/lang/Object;)Ljava/lang/String;
 	public fun get (Ljava/lang/String;)Ljava/lang/String;
 	public fun getContentLength ()Ljava/lang/Integer;
@@ -1070,7 +1070,7 @@ public final class org/hildan/krossbow/stomp/headers/StompUnsubscribeHeaders : o
 	public synthetic fun put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 	public fun put (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 	public fun putAll (Ljava/util/Map;)V
-	public synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
+	public final synthetic fun remove (Ljava/lang/Object;)Ljava/lang/Object;
 	public final fun remove (Ljava/lang/Object;)Ljava/lang/String;
 	public fun remove (Ljava/lang/String;)Ljava/lang/String;
 	public fun setContentLength (Ljava/lang/Integer;)V