blake3 is a variable output algorithm, so is this blake3-256?

[rchincha]

go-digest/algorithm.go

Line 98 in 22b78e4

BLAKE3 Algorithm = "blake3"

https://github.com/zeebo/blake3/blob/master/api.go#L17
^ does appear to default to 256-bit output, but would still make this mnemonic explicit

[rchincha]

A shorter mnemonic such as "b3-256" would be nicer, but runs the risk of name collision with a "barfoo3-256" hash func.