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Re:Arguing against using protobuffers by danharaj on Wednesday October 10, 2018 @05:54PM (#18189255)
Like, 5 lines later:

> For example, we can rebuild optional fields:

Re:Arguing against using protobuffers by _dmurph on Wednesday October 10, 2018 @06:01PM (#18189305)
How is this different than having both required and optional.
Re:Arguing against using protobuffers by danharaj on Wednesday October 10, 2018 @08:37PM (#18190158)
It's explained. Later in the article.