The maphash package from the blog post provides routines that call into Go's runtime to hash arbitrary types.

The maphash package in the standard library (hash/maphash) provides routines that hash string and []byte.

The builtin map type is a hash table.

Maphash is a library for computing hashes of arbitrary types in Go, not a map data structure.

Maphash is an (non-cryptographic-secure) hash function, like CRC32 / CRC64 / XXH3-64 and others, so it turns data in an (almost) uniq uint64.

The main difference is, it is an hardware accelerated & optimized compiler function, now exposed via the new maphash package in stdlib.

And it is fast. Faster than the former performance leader xxh3(avx2/avx512).

Try maphash yourself (example data dedupliction) https://news.ycombinator.com/item?id=34091206