code: <T> void registerSerializableClass(final Class<T> clazz, final Serializer<T> serializer) {
          synchronized (customSerializers) {
              customSerializers.add(new CustomSerializers<>(clazz, serializer));
          }
      }
docs: See {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
  
  @param clazz see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
  @param serializer see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
  @param <T> see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
  @see KryoSerializer#registerSerializableClass(Class, Serializer)