Except that when you're dealing with generic code which has to dealwith
multiple container types (like std.algorithm), you _need_ certaincomplexity
guarantees about an operation since it could happen on any
container that it's
Then, don't use it in std.algorithm or any other code that needs guaranteed complexity, just like now. I don't see the problem with a generic "in" operator, nobody would be forced to use it.
