It's not the operation, it is whether the argument is forced from numeric to string.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Mystery state (possibly about whether an argument is numeric?) being maintained across calls to a sub by BrowserUk
in thread Mystery state (possibly about whether an argument is numeric?) being maintained across calls to a sub by cheesestraws

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