> I believe this is supposed to be a and b here You’re right! It’s a typo. I changed the struct to use a and b instead of x and y, but didn't replace the follo

> I believe this is supposed to be a and b here You’re right! It’s a typo. I changed the struct to use a and b instead of x and y, but didn't replace the following paragraph. Thanks for noticing that. It’ll get fixed.