Function Oklch.isAchromatic
Reports whether chroma is exactly zero.
bool isAchromatic() const pure nothrow @nogc @property @safe;
Use this when exact achromaticity matters. For a caller-selected
tolerance, use isNearAchromatic instead.
Example
const gray = Oklchd(0.5, 0.0, OklabHued .fromDegrees(120.0));
assert(gray .isAchromatic);