[issue6410] Dictionaries should support __add__

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

> what would be the result of {"a": 1, "b": 2} + {"a": 2, "b": 1}?
> Should it be {"a": 1, "b": 2} or {"a": 2, "b": 1}?

or {"a":[1,2], "b":[1,2]}
As I remember, Guido rejected because of this ambiguity.

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nosy: +tjreedy

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<http://bugs.python.org/issue6410>
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