This panic only happened in debug builds because of a left shift
overflow. The slice range has bounds between 0 and 128. The 128 case
caused the overflow.
We now do an unbounded shift and a wrapped sub to get the correct
bitmask. If the slice range is 128 left, it should make 1 zero. Then the
wrapped sub would flip all bits, which is expected behavior.
Release Notes:
- N/A
Co-authored-by: Nia <nia@zed.dev>