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  * Copyright (C) 2012 The Guava Authors
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Custom GWT serializer for

GWT can serialize an absent Optional on its own, but the resulting object is a different instance than the singleton Absent.INSTANCE, which breaks equality. We implement a custom serializer to maintain the singleton property.

Chris Povirk
  public static void deserialize(SerializationStreamReader readerAbsent<?> instance) {}
  public static Absent<?> instantiate(SerializationStreamReader reader) {
    return .;
  public static void serialize(SerializationStreamWriter writerAbsent<?> instance) {}
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