[docs] [issue30550] Document order-preserving dictionary output in json

Inada Naoki report at bugs.python.org
Sun Jul 21 04:52:49 EDT 2019

Inada Naoki <songofacandy at gmail.com> added the comment:

OrderedDict is not recommended to preserve order any more.

Note that mention about `object_pairs_hook=OrderedDict` is removed intentionally.

Please forget about OrderedDict unless you need additional feature OrderedDict provides.  It is far inefficient than regular dict.

nosy: +inada.naoki

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