[issue39196] json fails to encode dictionary view types

[Inada Naoki]

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

If we support more types by default, user can not customize serialization of the type using `default` option.
That's why we don't accept "any iterable" but only list and tuple.

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39196>
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