That discussion seemed to mostly just conclude that dicts shouldn't have all set operations, and then it kind of just dropped off. No one really argued the subset part.
--
Ryan
[ERROR]: Your autotools build scripts are 200 lines longer than your program. Something’s wrong.
http://kirbyfan64.github.io/
Looks like it was discussed before:
https://mail.python.org/pipermail/python-ideas/2012- January/013252.html
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