decodes a base16 string, decoding is strict as required by RFC 4648 lowercase letters, non alphabet characters, line breaks, uneven length cause errors
0.094dev (2025-07-10 15:41:47 GIT hash eafa42ae743de61b62f958948d7abb5fada7756f built by fridi@fzen)
lowercase letters, non alphabet characters, line breaks, uneven length cause errors