Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

factorial(49) has 163 significant binary digits. It cannot be represented in 
floating-point without losses. And C functions log2() and exp2() can add 
additional errors, depending on platform. We rely on the assumption that all 
errors will be compensated, but there are no guaranties of this.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37295>
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