v4.0.0

Breaking changes

This release includes changes to how color strings are parsed, converted, and serialized, for better alignment to CSS specs:

• Clamp alpha to the [0, 1] interval at parse-time.
• Clamp L in lab() / lch() to [0, 100], in oklab() / oklch() to [0, 1] at parse-time.
• Correct numeric ranges in hsl() and hwb() syntaxes from [0, 1] to [0, 100].
• Serialize missing components as 0 in legacy syntaxes and as none in modern syntaxes.
• Use 0 for missing components in all color space conversions and gamut mapping functions.

New features

• Adds the IC_tC_p color space, part of CSS Color HDR Module Level 1, with the name itp;
• Adds the ΔE_ITP color difference function as differenceItp().

Fixes

• Make averageAngle() always return in the [0, 360] interval;
• Fix CIELUV (luv) conversion for l = 0;
• Allow CommonJS bare import const culori = require('culori') (in addition to the previous culori/require endpoint).