An empty range in Julia is `1:0`. So yes, they can form monoids just fine. I highly recommend you work with them _directly_ instead of carrying around the two e

An empty range in Julia is `1:0`. So yes, they can form monoids just fine. I highly recommend you work with them _directly_ instead of carrying around the two endpoints separately. For example, you can divide any range into two parts with: split(r) = r[1:end÷2], r[end÷2+1:end] That'll happily recurse and eventually spit out empty ranges given an input like `split(32:56)`. A zealous adherence to one strategy or another will simply blind you to the ways in which the other might be easier at different times.