Surely what you're looking for is some kind of typed hash table? Maybe you 
should be suggesting adding a TypedMapping to collections or something like 
that? But it seems to be your solution is fine, but maybe could abstract away 
the types in the keys in the class dunders?

```
class TypedMapping(dict):
    def __getitem__(self, item):
        return super().__getitem__((item, type(item)))
...
```
And so on
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