gh-156312: Prevent mailbox.MH replacement failures from corrupting messages - #156313
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gh-156312: Prevent mailbox.MH replacement failures from corrupting messages#156313lpyu001 wants to merge 1 commit into
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…ing messages Make `mailbox.MH.__setitem__()` failure-atomic by writing replacements to a temporary file before replacing the original. Failed serialization now leaves the existing message unchanged.
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Make
mailbox.MH.__setitem__()failure-atomic by writing replacements to a temporary file before replacing the original. Failed serialization now leaves the existing message unchanged.mailbox.MH.__setitem__()can destroy a message when replacement fails #156312