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Re:Comprehensive Python Cheatsheet (2018) by joshuamorton on Monday February 04, 2019 @03:25PM (#19080263)
Cpython took this implementation detail from pypy (so it was already going to be the case in the two most used python implementations).

The reason being that the ordered dict ends up being faster than non-ordered, and people will rely on this implementation detail, so they added it to the spec to make that okay.

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