Patches welcome. :)

If anything, I think I'd rather see things like grok_number() become hooks so you can intercept them, whether to augment, replace, or just add:

  warn "Hey, scare's over now, you can go back to 2 digits"
      if $num =~ /^20\d\d\z/;
[download]

Of course we probably don't reach grok_number() unless the lexer has already spotted a digit, so we'd need hot-pluggable grammars as well.

Hugo