[Retra]

Specifically, this:

>"Indexing between elements, instead of indexing elements, helps avoid a large class of off-by-one errors."

It only replaces them with indexing-method errors. Instead of remembering if my ranges are open or closed, I have to remember if they are using between-element indices or on-element indices. It's still going to cause the same kinds of problems.

[rcthompson]

You always have to remember what kind of indexing you are using in order to avoid making errors. But using this mental model will help people avoid making off-by-one errors because they don't even understand the indexing in the first place.