[issue30550] Document order-preserving dictionary output in json

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

Is there a reason to document object_pairs_hook=OrderedDict rather than just making the decoder populate a regular dict in an order-preserving way? (No idea if it does this already)

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nosy: +josh.r

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<https://bugs.python.org/issue30550>
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