I wouldn't qualify it as an edge case. It was more of a change in philosophy about teaching kids to spell, which is something like "kids should spell it the wa

I wouldn't qualify it as an edge case. It was more of a change in philosophy about teaching kids to spell, which is something like "kids should spell it the way it sounds". The change started in the US at least 15 years ago. When I went through elementary school > 30 years ago, not using an apostrophe for a contraction caused a reduction in grade. Also, contractions were disallowed in formal writing. For instance, using a contraction in a paper was a reduction in grade. Changing times and philosophies.