I should have said single-character additions or deletions . == And = have a levenstein distance of 1, == and := is 2. You can't simply make a typo and change

I should have said single-character additions or deletions . == And = have a levenstein distance of 1, == and := is 2. You can't simply make a typo and change an equality check to assignment. So, wiki defines levenstein distance as including substitution, but I was taught or at least remember it only being additions and deletions?