the readme is slightly incorrect also
this version of it DOES fully pass all of the BIP-340 tests, there was an extra 4 that involve variable length messages and it passes them too, i tried to get this fixed in the original in btcd/btcutil but roasbeef said "it wasn't necessary to complete" the changes were simple anyhow, and my library is fully compliant to BIP340, even if you are only ever gonna use it on 32 byte hashes