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 (2025-06-18 15:08:51 GIT hash 89cffc23ae669b0898a5564fefbf793fcb8e5ca7 built by fridi@fzen)
lowercase letters, non alphabet characters, line breaks, uneven length cause errors