Brandt Bucher <brandtbuc...@gmail.com> added the comment:

The plan is to follow dict’s semantics. The |= operator will basically delegate 
to the first map in the chain. The | operator will create a new ChainMap where 
the first map is the merged result of the old first map, and the others are the 
same.

So, basically update / copy-and-update, respectively.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36144>
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