Harmonizing the JSON serialization of non-finite float values with browsers and other languages

Ideas
4

I wouldn’t be surprised if someone out there was using allow_nan=None to mean allow_nan=False. We shouldn’t change the meaning silently.
Solutions I can think of:

  • Adding a new argument, like nonfinite=None. Initially it would only take None but it could be extended in the future, if necessary.

  • Using a specific value that’s very unlikely to be used currently, like allow_nan='null'. To allow future extensions, start emitting a DeprecationWarning when a non-bool is passed to allow_nan.

    This would technically be a backwards incompatible change, but it could get a SC exception.

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