Make the shiftpush op a bunch more efficient when handling more than a single element. We still call it with 1 far, far too often, but this helps for the other cases. for 1..100000 { } gets 3 times faster with this patch, for example.
Make the shiftpush op a bunch more efficient when handling more than a single element. We still call it with 1 far, far too often, but this helps for the other cases. for 1..100000 { } gets 3 times faster with this patch, for example.

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