I was looking for a calculation to convert between RGB and HSL color spaces and found some equations in the latest W3C CSS Color Module Level 4 working draft (15 Dec 2021). But the calculation for converting sRGB colors to HSL colors sets the hue value to NaN [1]. Why? If I can't trust the standard to be correct, then what can I trust?[1] - https://www.w3.org/TR/css-color-4/#rgb-to-hsl