Please add support for XXH3_64 / xxhash

[berlin4apk]

Please add support for XXH3_64 / xxhash Important With a magic prefix/suffix (perhaps XXH3_0123456789abcdef) See https://github.com/Cyan4973/xxHash/issues/447 For the background.

31.5 GB/s on a Intel i7-9700K! "xxHash is an Extremely fast Hash algorithm, running at RAM speed limits. It successfully completes the SMHasher test suite which evaluates collision, dispersion and randomness qualities of hash functions. Code is highly portable, and hashes are identical across all platforms (little / big endian)."

[rhash]

Duplicate of #134.

[mrbluecoat]

+1