You're talking about global variables, not constants.

He's talking about old-school constants... (you know... the way we used to do it... back in the paradise garage...)

$ perl -le '*PIE=\"Apple"; $PIE = "foo"'
Modification of a read-only value attempted at -e line 1.
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Please excuse my Doc Martin impression.

-sauoq
"My two cents aren't worth a dime.";