Mark Borgerding <mborg...@gmail.com> added the comment:

So third-party code was knowingly broken to satisfy an aesthetic notion that 
substitution should be more like iteration.

Would not a FutureWarning have been a kinder way to stage this implementation?

A foolish consistency, indeed.

----------
nosy: +Mark Borgerding

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<https://bugs.python.org/issue32308>
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