[throwaway8291]

That surprised me, when I first saw it. If someone takes a minute to read the docs (e.g. Python), one would never build something knowing that order is not guaranteed (e.g. order in dictionaries). But seemingly people do.

[UncleEntity]

Had some code break while porting from 2 to 3 because it assumed dict order and it was part of the official Python build system, the old spark parser for the AST module.