This is part of bug [[https://bugs.kde.org/show_bug.cgi?id=355727 | 355727 ]].
Color clamping occurs basically on three different entities:
- serialization: `colorToXML` and `colorFromXML`
- math tooling: usage of `KoColorSpaceMaths<_T, _Tdst>::scaleToA`, and color space properties such as `KoColorSpaceMathsTraits::zeroValue` and `KoColorSpaceMathsTraits::unitValue`, most commonly with a `qBound` to clamp extrema
- Qt facilities: usage of `QColor`'s HSL/V conversion facilities, which all clamp instantly to 16-bit sRGB