export {
    let angle-normalize =
        λ a : Angle
            ~ Degree
            ~ ℝ_0,360
            ~ ℤ_360
            ~ ℤ_2^64
            ~ machine.UInt64
            ~ machine.Word
    ↦ Angle~Degree~ℝ_0,360~ℤ_360: machine.UInt64.rem a 360;

    let angle-degree-to-turns =
        λ a : Angle
            ~ Degree
            ~ ℝ_0,360
            ~ ℝ
            ~ machine.Float64
        ↦ f/ a 360 ;
}