Resolve issue with OTP 22 performance https://github.com/martinsumner/leveled/issues/326 - by changing refernces to loop state.
The test perf_SUITE proves the issue.
OTP 22, without fixes:
Fold pre-close 41209 ms post-close 688 ms
OTP 22, with fixes:
Fold pre-close 401 ms post-close 317 ms
