This contributor doesn't appear to know how mmap works if they're claiming the only benefit is sharing data between processes (what? MAP_PRIVATE mappings aren't

This contributor doesn't appear to know how mmap works if they're claiming the only benefit is sharing data between processes (what? MAP_PRIVATE mappings aren't shared), and that memory is leaked after the process exits. There are a lot of thorny issues with mmap, and I'm sure there are legitimate regressions with the approach and things to be fixed, but it sure would be nice to see an analysis from someone who actually knows what mmap is.