[$] Python and hashing None

The recent discussion of a proposed change to the Python language-the usualfare on the language's Ideasforum-was interesting, somewhat less for the actual feature underdiscussion than for the other issues raised. The change itself is a minor, conveniencefeature that would provide a reproducible iteration order for certainkinds of sets betweenseparate invocations of the interpreter. That is a pretty limited use case, and onethat could perhaps be fulfilled in other ways, but the discussion alsohighlighted some potentially worrying trends in the way that feature ideas are handled inthe Python community.