mattip <[email protected]> added the comment:
The pickle output has the sign-bit set. Ignoring the sign-bit, it is unpickled
correctly. However math.copysign using this value will now return minus on
platforms where copysign(3., float('nan')) is known to work.
Perhaps the whole can of worms should not have been opened in the first place.
Another solution would be to raise a ValueError if copysign(x, float('nan')) is
called...
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<http://bugs.python.org/issue14521>
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