vendor: key the extraction cache on the keep-filter tag - #86
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A keep-filter
fnpointer has no stable identity, so the per-package.{flat}.versionmarkers reuse a cached tree even after the filter's shape changed.PackageSpec::keep_tagged(tag, keep)folds a caller-named tag into the cache key, the same waycompiled_keyfolds the compile schema: changing the tag re-extracts the package, and a tree cached without a tag re-extracts once on adoption.Plain
keep()stays tagless and behaves as before.