Alexander Belopolsky added the comment:
Mark,
Raymond suggested that "The PEP 3141 should be revised to say that floor
division is defined to return a value that is *equal* to an Integral".
Since nan or inf are not *equal* to any Integral, the current implementation
does not comply. In the absence of a recommendation in the PEP, implementers
of new numeric types are left with little guidance because existing types are
inconsistent:
>>> Decimal('inf') // 1
Decimal('Infinity')
>>> float('inf') // 1
nan
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<http://bugs.python.org/issue22444>
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