When you say @{bareword}, Perl doesn't do anything to the bareword, and thinks you're just enclosing the variable name in braces. The reason this is useful is when you're printing something like "the ${n}th time", where you want $n, not $nth.
The + here disambiguates things; it tells Perl that this is not just a "roped-off" variable name, it's an expression to be evaluated.
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Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
Perl,
regex,
and perl
hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart
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