Decoding invalid base64 with state machines
summary
Implements a Go-based finite state machine that decodes malformed or mixed-variant base64 by parsing characters into states (start, alphabet, URL/standard variants, end), peeking ahead to peeks the next characters and recovering when invalid input appears. The decoder replaces invalid sequences with a default character and resumes decoding, lives in the Wapty decode package, needs only a new state to add a variant, and trades raw speed for robustness, debuggability and easy unit testing.
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