Mark Dickinson <dicki...@gmail.com> added the comment:

It's a bit cheap and nasty, but I think we could simply replace the line:

    if (fabs(x) < 1.0)

in is_error with

    if (fabs(x) < 2.0)

perhaps with an explanatory comment. All we need to do is distinguish underflow 
from overflow, and 2.0 is still clearly a _long_ way away from any overflow 
boundary.

It would be good to have a test that would trigger the behaviour, too.

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<https://bugs.python.org/issue46018>
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