[Python-ideas] Allow using ** twice

[Nick Coghlan]

> If you wanted to do that you'd use a Counter:
>
> >>> from collections import Counter
> >>> dict1 = Counter()
> >>> dict2 = Counter()
>
> >>> dict1["arg1"] = 5
> >>> dict2["arg1"] = 3
> >>> dict1 + dict2
> Counter({'arg1': 8})
>
> As for dicts, -1.

*If* anything were to change for dicts, it would be to change or add
methods (such as a new alternative constructor) rather than add operator
support.

Cheers,
Nick.

>
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