view tests/missing-comment.hg @ 24284:ff14b26fe5f4

hook: add a generic hook right before we commit a transaction

We are adding a 'txnclose' hook that will be run right before a transaction is
closed. Hooks running at that time will have access to the full transaction
content through both 'hookargs' content and on-disk reading. They will be able
to abort the transaction.

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