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ffa0815285
The series frame is the native PromQL path's internal transport, and that path lives on `narthex`, an experimental branch: it may break its own formats between revisions, so a frame revision number has no compatibility promise to protect. The marker becomes movable once the path reaches a release branch, where a producer and a consumer can legitimately be different revisions. The reader still refuses a frame that declares any other value, which turns a mismatched producer into an error instead of values decoded under the wrong columns. The two wire fixtures are renamed to `v1_metadata.json`, and the drift cases now use the value that is not current.