Extremely useless but fast SIMD functions for dealing with hex
Fahtsex requires SSSE3-compatible cpu or better: use RUSTFLAGS="-C target-cpu=native" if
CPU is supported and you don't intend to distriute the binaries, or use something like
RUSTFLAGS="-C target-feature=+<arch>" where <arch> is one of ssse3, avx, avx2 or
something in between (idk, I, the docwriter, have not tested it on anything except these three)
Use cargo bench to see what the speed difference on your machine is