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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