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Merge pull request #3158 from Zac-HD/pprint-weird-nans
Distinguish negative and signaling NaNs in our pretty-printer
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RELEASE_TYPE: minor | ||
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Did you know that of the 2\ :superscript:`64` possible floating-point numbers, | ||
2\ :superscript:`53` of them are ``nan`` - and Python prints them all the same way? | ||
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While nans *usually* have all zeros in the sign bit and mantissa, this | ||
`isn't always true <https://wingolog.org/archives/2011/05/18/value-representation-in-javascript-implementations>`__, | ||
and :wikipedia:`'signaling' nans might trap or error <https://en.wikipedia.org/wiki/NaN#Signaling_NaN>`. | ||
To help distinguish such errors in e.g. CI logs, Hypothesis now prints ``-nan`` for | ||
negative nans, and adds a comment like ``# Saw 3 signaling NaNs`` if applicable. |
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