tree 6afaf3b6cae3b9fb7cc4ee34c1eb023e99b8aba7
parent c65a0412e71e8b9b3bfd22925720d23c0f054237
author Joe Tsai <joetsai@digital-static.net> 1516916583 -0800
committer GitHub <noreply@github.com> 1516916583 -0800
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proto: add DiscardUnknown function (#498)

This copies the discardLegacy logic from the dev branch.
The unit tests are located on the dev branch and will be merged
into the master branch in the near future.

This function is cherrypicked into master in order to support the
master to dev transition.