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gh-159739: Fully clear the unpickler memo - #160173
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Clearing an Unpickler memo left its sequential index and sparse entries intact, so reusing the unpickler for an independent record could raise UnpicklingError or retrieve an object from a previous record. Replace the memo and reset all of its state before releasing the old entries. Backport to 3.15; manually backport only the counter reset to 3.14, which has no sparse memo.
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Clearing an Unpickler memo left its sequential index and sparse entries intact, so reusing the unpickler for an independent record could raise UnpicklingError or retrieve an object from a previous record. Replace the memo and reset all of its state before releasing the old entries. Backport to 3.15; manually backport only the counter reset to 3.14, which has no sparse memo.