Support proto3 field presence (optional fields) #66
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What's in this PR?
Protobuf recently added support for field presence. In a proto file, they are denoted by the
optional
keyword, e.g.Why?
Support for optional fields is opt-in on a per-code-generator basis. Without adding a particular flag, you get an error:
As far as I can tell, there should not be anything special we need to do to support optional fields in Twirp as we only reference message types and don't do anything with their fields.
Companion PR: twitchtv/twirp#332
Example Usage
See above.
Checklist