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* filer: let a nested path rule turn worm off mergePathConf ORs the booleans, so worm set on a bucket could never be lifted on a directory under it, while every string field is overridden by the more specific rule. Make worm tri-state instead: unset inherits, set wins. readOnly, fsync and disableChunkDeletion keep the OR, so a nested rule still cannot escape a lock the bucket set. Configurations written before this carry an explicit "worm": false on every rule, because they are marshalled with EmitUnpopulated. Reading those back as an override would quietly drop worm from nested paths, so filer.conf is now stamped with a version and the flag is dropped to unset when the version predates it. * filer: copy the worm value out of the matched rule mergePathConf aliased the pointer into the merged result, so a caller that wrote through it would reach into the stored rule.