[Python-ideas] Make MappingProxyType picklable

[Antony Lee]

Currently, mappingproxies are not picklable, which (among other things)
lead to signature objects being non picklable.  Could this be easily fixed,
or is there a stronger reason for not allowing that pickling?
If mappingproxies cannot be made picklable, perhaps signatures can
implement __getnewargs__ to allow pickling?
Antony
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