[issue21514] update json module docs in light of RFC 7159 & ECMA-404

[Bob Ippolito]

Bob Ippolito added the comment:

This patch looks reasonable to me as-is.

With regard to "Infinite and NaN number values are accepted and output;" there's an option for that (allow_nan=False in encoding, parse_constant=some_function_that_raises in decoding). Since an exception can't be raised in a lambda there's no simple one-liner to ensure compliant decode.

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