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I said that the warning for underflow should not be a pedwarn, and that it's unclear if the warning for overflow should be one either if infinities are supported (probably it should only be a pedwarn if they aren't, so my 2004-10-08 patch was wrong in that regard).
Humm, I can try to fix that, if that is what you want to do. Sure there is a way to know whether infinities are supported or not.
I think the warning for underflow is useful (and maybe should be on by default), but doesn't fit any of the existing warning options.
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