I think this PEP doesn't include one big disadvantage of the + operator.

If we use + for dict merging, set doesn't support + looks strange
and inconsistent.

And if we add + to set too, set has three way (method, |, and +) to do merging.

Then, all builtin container classes support +.  It looks + is the common
way to merge two containers in some way.  Shouldn't we add it to abc?

So I think we shouldn't focus just adding `+` to dict.  It comes with huge
side effect.  We should think about general API design of the (esp. builtin)
containers.

Regards,
-- 
Inada Naoki  <songofaca...@gmail.com>
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