Module alphabet 

Code alphabet (RFC-003).

An Alphabet is a validated, deduplicated set of ASCII symbols used for code generation. The default excludes visually ambiguous glyphs (0 1 O I L) so non-technical users can read and re-enter codes reliably.

Structs

Alphabet

A validated set of ASCII code symbols.

Constants

DEFAULT_ALPHABET

The default unambiguous alphabet: ASCII uppercase letters and digits with 0, 1, O, I, L removed. 31 symbols (RFC-003 §4).