which is not necessarily less obfuscated though.

Yet another way which is, perhaps, a little more clear: 

@{$pkg . '::_ATTR'} = @_;

[download]
It's probably expected, though, that anyone reading or changing code using caller and symbolic refs will understand the other forms.

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

In reply to Re^2: why the variable is used this way? by sauoq
in thread why the variable is used this way? by Anonymous Monk

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