Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

One other issue just came to mind.  While we could convert NaN to null during 
encoding, there isn't a reasonable way to reverse the process (a null could 
either be a NaN or a legitimate None).  That would limit the utility of a new 
optional conversion.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40633>
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