Embarrassing holes in documentation, being fixed as they're uncovered.
Embarrassing holes in behaviour, somewhat harder to fix (Ilya's work
on the unsigned integer arithmetic is a start).
Overlapping features give weird behaviour. $SIG{__DIE__} and eval.
Perl is a big language. Think of the third argument to split.
Think of question marks as regexp delimiters. Think of "use Mod ()"
being special cased in the parser. Unless you know every bit,
something is going to bite you.
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