bpo-36144: Update MappingProxyType with PEP 584's operators (#18814)#311
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We make `|=` raise TypeError, since it would be surprising if `C.__dict__ |= {'x': 0}` silently did nothing, while `C.__dict__.update({'x': 0})` is an error.
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We make
|=raise TypeError, since it would be surprising ifC.__dict__ |= {'x': 0}silently did nothing, whileC.__dict__.update({'x': 0})is an error.