Mark Dickinson <dicki...@gmail.com> added the comment:

@Arjan Staring: could you point to which part of the JSON specification you're 
looking at?

At https://tools.ietf.org/html/rfc7159, the only reference to NaNs that I see 
is:

> Numeric values that cannot be represented in the grammar below (such
> as Infinity and NaN) are not permitted.

At https://www.json.org/json-en.html, there's no mention of IEEE 754 special 
values.

I'm not seeing anything anywhere to suggest that the JSON specification says 
NaNs should be translated to nulls.

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