zlib-ng

• --without-unaligned improves safety; has been removed as of 2.2.3
• configure depends on bash, but can be patched easily
• libdeflate is faster than zlib-ng but is not a drop-in replacement for zlib

References

• https://github.com/gentoo/gentoo/pull/17167
• https://quixdb.github.io/squash-benchmark/?visible-plugins=zlib,zlib-ng