tone method
Create an ARGB color with HCT hue and chroma of this Tones instance, and the provided HCT tone.
Implementation
int tone(int tone) => _cache.putIfAbsent(
tone,
() => tone == 99 && Hct.isYellow(hue)
? _averageArgb(this.tone(98), this.tone(100))
: Hct.from(hue, chroma, tone.toDouble()).toInt(),
);