Comment #7 on issue 257 by ken...@google.com: Java Protocol buffer payload more than that of regular payload when using repeated tag
http://code.google.com/p/protobuf/issues/detail?id=257
One way that Java serialization can be smaller is if you have a lot of repeats of the same values. Java serialization allows back-links to objects that appeared previously in the stream. Protobuf serialization is strictly a tree; if you need back-links, you have to do it manually, by storing the redundant values in a separate table and indexing into it from the rest of the message.
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