In Perl Best Practices (Ch. 4) TheDamian recommends "use Readonly" instead of "use constant", both because it prevents further modification of the value, and because Readonly gives your constants the syntax properties you would expect to go with their having a sigil.

In reply to Re^2: Top 10 things to read when your flight is canceled by rodion
in thread Top 10 things to read when your flight is canceled by bobf

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