message: Remove the strings "key type".
diff: @@ -196,8 +196,7 @@ public final class SerializationRegistry {
  @Override
  public String toString() {
  - return "key type "
  - + keyClass.getSimpleName()
  + return keyClass.getSimpleName()
  + " with serialization type: "
  + keySerializationClass.getSimpleName();
  }
  @@ -230,8 +229,7 @@ public final class SerializationRegistry {
  @Override
  public String toString() {
  - return "key type "
  - + keySerializationClass.getSimpleName()
  + return keySerializationClass.getSimpleName()
  + ", object identifier: "
  + serializationIdentifier;
  }
  