Chris Angelico writes:
> >>> {"a":1}+{"b":2}
> It would make sense for this to result in {"a":1,"b":2}.
The test is not "does this sometimes make sense?" It's "does this
ever result in nonsense, and if so, do we care?"
Here, addition is usually commutative. Should {'a':1}+{'a':2} be the
same as, or different from, {'a':2}+{'a':1}, or should it be an error?
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