clawbot
4009490242
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Requests that missed the same variant at once each fetched and transcoded it. They now share one call through golang.org/x/sync/singleflight, keyed on the variant cache key. The first request processes the variant with a context that does not end with its own; the others wait for its result, holding no connection or processing slot, and return as soon as their own context ends. The processing request waits even then, as before. Each request counts one miss; the processing counts its fetch and transcode once. A panic while processing becomes an error instead of stopping pixad. Model: opus-5-5