Under the hood
Useful2 Signal2
Transcript appends skip a lookup and let storage enforce the check, saving a round trip each time.
What's wrong with this entry?
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What
Appending to a session transcript no longer looks the object up first to confirm it exists and is non-empty. The append itself now carries precondition: { type: "ifExists", nonEmpty: !0 } and lets the storage backend enforce both, saving one storage round trip per append on the v5 backend.
Evidence
precondition: { type: "ifExists", nonEmpty: !0 }
Strings lifted out of the shipped bundle, so the claim above can be checked against them.