in reply to The trap of reference numification
I don't know if it's that rare; I've seen it used quite a bit to generate an object ID of some sort (stringification is also used for that). If you add that as a warning, many currently warning-free programs would start spewing lots of warnings, which might be annoying... But I agree that in principle such a warning would be useful, and I imagine the same drawbacks apply whenever a new warning is added.
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