square/wire — pull request #130 by danrice-square (2014-04-24 20:30:26+00:00)
Title: Reduce memory footprint and data copying

@JakeWharton

There are three improvements here:

* Deserialize repeated fields directly into an externally-immutable form
* Get rid of expensive TreeMaps to store extensions on messages
* Iterate over extensions more cheaply when serializing