Mark Dickinson added the comment:
There's a (to my mind) unfortunate change in behaviour here. Under normal IEEE
754 rules, some C double values larger than FLT_MAX still round to FLT_MAX
under conversion to float.
Python 3.6:
>>> import struct
>>> x = 3.40282356e38
>>> struct.pack("<f", x)
b'\xff\xff\x7f\x7f'
Following the changes in this PR:
>>> import struct
>>> x = 3.40282356e38
>>> struct.pack("<f", x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: float too large to pack with f format
The original behaviour is correct with respect to IEEE 754; the new behaviour
is not. I think this is a case where the cure is worse than the disease.
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<https://bugs.python.org/issue31373>
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