I found some insightful comments below the post: >I think that char – char should definitely be legal. The distance between characters is well defined. Same fo

I found some insightful comments below the post: >I think that char – char should definitely be legal. The distance between characters is well defined. Same for char + numeric. Both logically makes sense. I think a good analogy might be floors in a building. Asking what’s the distance between the second and seventh floor makes sense, or what’s two floors above the 4th. But the question ‘what’s the 5th floor plus the 6th floor’ doesn’t make sense. >Affine space describes these kind of relationships in mathematics. Eg position and disposition in n dimension, or count and offset in buffers, even timestamp and duration.