I could have done more, but it somewhat vindicated what I was saying really. It has a very similar core to bsc (based on the same code) and gives very similar file sizes as expected. Note you may wish to use bsc -tT to disable both forms of threading. I don't know if that changes memory usage any.

Have you tried making PRs back to libbsc github to fit the UB and fuzzing issues? I'm sure the author would welcome fixes given you've already done the leg work.

Anyway, please do consider benchmarking against libbsc. It's conspicuously absent given the shared ancestry.