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prost doesn't implement editions, and likely never will (maintenance-status passively-maintained means that no new features are planned), right?
Given that, prost doesn't seem like a good choice to me in the long run. But it does appear to be the most popular implementation by far right now.
An adapter crate as mentioned above might make make it easier for users to migrate step-by-step. I suppose you prefer to get a sense for whether that's really the case first?