Warnings are jsut warnings. Once you've seen it and decide that it's not a problem, you can turn it off for a bit.

{
# local $^W = 0; # old way
no warnings;
$value = (  int($value) == $value ) ? $value : lookupString( $value );
}
[download]

However, if you're using constants in the code, strings are much better (if they are descriptive). Don't take a step backwards by making everything a magic number. :)