public extension FloatingPoint {
  @inline(__always) var degrees: Self { self * (180 / Self.pi) }
  @inline(__always) var radians: Self { self * (Self.pi / 180) }

  @inline(__always) func lerp(_ a: Self, _ b: Self) -> Self { b * self + a * (1 - self) }
  @inline(__always) func mlerp(_ a: Self, _ b: Self) -> Self { a + self * (b - a) }

  @inline(__always) func clamp(_ a: Self, _ b: Self) -> Self { min(max(self, a), b) }
  @inline(__always) var saturated: Self { self.clamp(0, 1) }

  @inline(__always) func smoothStep() -> Self { self * self * (3 - 2 * self) }
  @inline(__always) func smootherStep() -> Self { self * self * self * (self * (self * 6 - 15) + 10) }
}