gh-142665: fix UAF when accessing a memoryview concurrently mutates the underlying buffer
#143324
+13
−3
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…utates the underlying buffer
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This fix actually changes the existing behavior but messing up with the memoryview while still being accessed is honestly a poor design choice and I don't know when it'd be legitimate to support bad slicing.
memoryviewslicing via re-entrant__index__#142665