R. David Murray added the comment:

By the way, when I say "again", I'm referring to the "return type of 
alternative constructors" thread:

  http://www.mail-archive.com/python-dev@python.org/msg92163.html

This is effectively an extension of that discussion, because replace is an 
alternative constructor, with the additional complication of taking an existing 
instance as input.

Rereading that thread, I think Guido's answer is that the subclass API needs to 
be clearly documented:

   http://www.mail-archive.com/python-dev@python.org/msg92191.html

Which I guess means we get to decide what it is, and then figure out how to 
implement it.

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