R. David Murray added the comment:

Well, while 'coercion' does refer to changing from one type to another, and 
technically we are doing that here, in OO we generally think of subclasses as 
more-or-less being of the same type as the superclass.  So I think it would be 
clearer to spell out that we are changing the object type to be that of the 
superclass.

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<http://bugs.python.org/issue15984>
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