pub fn gen_random_uuid_bytes() -> [u8; 16]Expand description
v7.17.0 — generate a RFC 4122 v4 (random) UUID. Layout: 16
random bytes with the version nibble (high nibble of byte 6)
pinned to 0100 (= 4) and the variant top bits (high two bits
of byte 8) pinned to 10 — exactly what PG’s
gen_random_uuid() and the historical uuid-ossp
uuid_generate_v4() produce.