Under the hood
Useful1 Signal2
Job pins and first shared-state writes now publish atomically with a umask-derived file mode.
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What
On the v5 storage path, the jobs pin update and the first write of a shared state file now publish atomically with an explicit file mode derived from the process umask, and the first write tolerates one more error class besides "already exists" before falling back.
Evidence
publishDiscipline: "atomic"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.