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Comment by zokier

4 days ago

NaN is not part of JSON by any spec. Top level scalar values were disallowed by RFC 4627.

Fair enough. I'm not sure how much JSON parsers in the wild care about that spec. I just tried with Python and it was happy to accept scalars and NaN. JavaScript rejected NaN but was happy to accept a scalar. But sure, compliant parsers can disregard those cases.