[issue26040] Improve coverage and rigour of test.test_math

[Jeff Allen]

Jeff Allen added the comment:

Mark: Thanks for doing my homework. Points 1 and 3 I can readily agree with. I must take another look at to_ulps() with your patch on locally. I used the approach I did because I thought it was incorrect in exactly those corners where you prefer it. I'll take a closer look.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26040>
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