Vedran Čačić <ved...@gmail.com> added the comment: 1. +0 _if_ the implementation is easy to explain. If backward compatibility is an issue, we can always add a property: for flag in flags.set: (though set might imply unorderedness:) 2. -1. Guido said long ago that all lens should be O(1). (Of course, if you do make it O(1), I have no objection.) 3. +1, absolutely.
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