Shade levels that can be optionally included in maps for this system.
0.1.0-alpha — Introduced as a global Levels.Optional type in 02-tokens/@types.d.ts.
Levels.Optional
02-tokens/@types.d.ts
0.1.1-alpha.0 — Moved to ColourUtilities.Levels and renamed.
Shade levels that can be optionally included in maps for this system.