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<@U0HUJ25V1> We had such ranges in mind: so before 1.0 we had renamed `Range` to `ClosedRange` and its `end` property to `endInclusive` and dropped `FloatRange` and `DoubleRange` to make it possible to introduce open-ended ranges without breaking changes later.

So are y'all just waiting for use cases to justify them? If so, I can put them together and file a KEEP or issue.

Starting a KEEP.  Not sure what the best way is to invoke an exclusive range.

The `start..end` operator is already reserved for inclusive ranges. Maybe `(start..end).endExclusive()` would be the best way to construct an end exclusive range?