pub const DEFAULT_ALPHABET: &[u8] = b"ABCDEFGHJKMNPQRSTUVWXYZ23456789";Expand description
The default unambiguous alphabet: ASCII uppercase letters and digits with
0, 1, O, I, L removed. 31 symbols (RFC-003 §4).
This matches the zinnias-ciao generation alphabet exactly, so codes
generated by either side draw from the same symbol set.