fix _growbeg! unnecessary resizing#56029
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oscardssmith merged 7 commits intomasterfrom Oct 10, 2024
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This was very explicitly designed such that if there was a bunch of extra space at the end of the array, we would copy rather than allocating, but by making
newmemlenbe at leastoverallocation(memlen)rather thanoverallocation(len), this branch was never hit. Fix #56026