Does the "required" keyword have any extra meaning, or is it irrelevant with protobufs v3?

[RedMarcher]

I just learned today that Protobufs V3 actually decided to remove the required and optional attributes. I'm wondering if the definition in Goa does something extra, or if it's a legacy feature meant to support prior versions of protobufs.

[raphael]

Goa generates explicit validation code based on the use of Required in the design. It leverages Protobuf v3 new optional keyword to implement the validation code (and implements the same logic for any HTTP endpoint as well). So definitely not legacy.