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You need it when an empty string is a valid value in your domain.

A better example is Int32Value. By default, protobuf will serialize int32 to 0 if it's not present.

I think the other commenter’s point is you can use 2 fields to distinguish between the first field being specified as empty vs absent (or whatever terms you prefer).

E.g.

- type.specified => “”

- type.unspecified => empty

The same technique can be used to disambiguate between 0 and empty.

Worth noting that it’s not quite equivalent due to allowing for a malformed message that includes foo = value and hasFoo = false, opening the door to varied client interpretation.

But why would you do that over using the built-in StringValue, that just works and does everything you need?

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