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/;
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.
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