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A comment on Types as Interfaces. Parent comment

Re:Types as Interfaces by taeric on Tuesday July 23, 2024 @03:45PM (#41050009)
Protobufs are also a fun place to look for how much debate people will get into regarding required versus optional fields. Your post is taking an implicit "everything is optional" view. But, it does allow you to be stricter.

Common Lisp Object System also touched on all of these ideas years ago.

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Re:Types as Interfaces by smackmybishop on Tuesday July 23, 2024 @06:32PM (#41051684)
Everything has been `optional` for about a decade.

> The option to set a field to required is absent in proto3 and strongly discouraged in proto2.

https://protobuf.dev/overview/#syntax

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Re:Types as Interfaces by taeric on Tuesday July 23, 2024 @07:06PM (#41051954)
Ah, I dropped off protobuf a while back. I definitely remember a lot of uproar about it, at the time.
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