look it's the Dunning-Kruger poster boypic.twitter.com/pOVDz3hU2e
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Since precision is completely unspecified, the result of `1.0 + 1.0` could fall outside the range of representable values, which should trigger UB. There is also additional IDB, e.g., from the fact that `FLT_ROUNDS` might be set to 12. AFAIK "generally sane behavior" isn't specd.
The example had no arithmetic.
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