Scale::inverse negates the scale instead of inversing it.

[klotzambein]

There are two inverse functions for the Scale type. One called "inv" and another called "inverse". The first function ("inv") properly inverses the scale. While the second function just negates the scale. If this is the desired behavior it probably should be noted in the documentation.

This is an example of how we can end up with a wrong identity scale:

struct A;
struct B;
let scale: Scale<f32, A, B> = Scale::new(2.);
let identity_scale = scale * scale.inverse();
assert_eq!(identity_scale.get(), -4);

[nical]

For some reason I missed this notification. The behavior of inverse indeed sounds quite bad to me.