ruby-grape / grape / 35537785984

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Replace a registry on registration instead of writing into it (#2976)

A registry is written when a formatter, parser, params builder,
validator or versioner class is defined, and from then on it is only
ever looked up -- on the request path, at that, once per response, per
parsed body or per params build.

Have register build the next Hash and freeze it, rather than writing
into the one readers hold. Nothing can find a registry changed
underneath it, and nothing can write to one without going through
register. The spec-only deregister helper replaces the registry in turn.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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