[issue34858] MappingProxy objects should JSON serialize just like a dictionary

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Using the default method or argument is a proper way of serializing custom types to JSON. There are a number of issues fr adding support for serializing different types by default. I work on a patch that will allow to make different types serializable in a more convenient way.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue34858>
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