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For the specific question, a better option might be to use overload and do dispatch based on the value you get. Something like:
package SomeData; use overload '+' => 'add', '-' => 'subtract', fallback => 1; sub add { my ($x, $y) = @_[0..1]; ($x, $y) = ($y, $x) if $_[2]; $self->{is_number} ? $x + $y : $x . $y; }

Now, personally, I would never overload + to act as string concatenation. Concatenation isn't commutative, which breaks the implicit contract most people have with addition. As well, how do you define multiplication for strings?

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Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.


In reply to Re: inheritance turns back and bites by dragonchild
in thread inheritance turns back and bites by dada

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