f32::fract functions differently compared to GLSL; thoughts on documentation updates and an example showing the difference?

[Steveplays28]

https://godbolt.org/z/v9cj4MaGW
This also extends to various glam types:

• glam::f32::Vec2::fract
• glam::f32::Vec3::fract
• glam::f32::Vec4::fract

Is it ok if I PR documentation updates and if I also add a shader crate demonstrating this difference, with the following code (and an example usage of this trait) alongside the existing examples?

pub trait FractGl {
    type Output;

    fn fract_gl(self) -> Self;
}

impl FractGl for f32 {
    type Output = Self;

    fn fract_gl(self) -> Self {
        self - self.floor()
    }
}

(glam has glam::f32::VecN::fract_gl types with documentation explaining the differences, but f32 does not, hence the above trait.)

I'd also like to add these methods to clippy's disallowed methods check in the examples, to prevent this pitfall.

disallowed-methods = [
    "f32::fract",
    "glam::f32::Vec2::fract",
    "glam::f32::Vec3::fract",
    "glam::f32::Vec4::fract",
]