Personally, I find that just having "0..count" requires a bit of thinking on my part trying to decide if it's inclusive or not. "0..<count" instantly tells me

Personally, I find that just having "0..count" requires a bit of thinking on my part trying to decide if it's inclusive or not. "0..<count" instantly tells me that it's not including value, and follows the matematical interval notification [0..count] vs [0..count)