Under the hood
Useful1 Signal2
Transcript writes now track each entry's storage format version and flush when it changes.
What's wrong with this entry?
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What
Session file appends now carry each entry's storage-format version, flushing a batch early when that version changes partway through a buffer, and the append records where it came from.
Evidence
materializeSessionFile
Strings lifted out of the shipped bundle, so the claim above can be checked against them.