One interesting side-effect of using 1-based closed indexing (i.e. numbering the positions, not between the positions) is that a zero-width range (which is some

One interesting side-effect of using 1-based closed indexing (i.e. numbering the positions, not between the positions) is that a zero-width range (which is something that actually comes up in genomics) starts at position N and ends at N-1.