(错误) `mix` 函数的算法存在致命错误

dart-sass:

  return SassColor.rgb(
      fuzzyRound(color1.red * weight1 + color2.red * weight2),
      fuzzyRound(color1.green * weight1 + color2.green * weight2),
      fuzzyRound(color1.blue * weight1 + color2.blue * weight2),
      color1.alpha * weightScale + color2.alpha * (1 - weightScale));
}
polished:

const mixedColor = { red: Math.floor(color1.red * weight1 + color2.red * weight2), green: Math.floor(color1.green * weight1 + color2.green * weight2), blue: Math.floor(color1.blue * weight1 + color2.blue * weight2), alpha: color1.alpha * parseFloat(weight) + color2.alpha * (1 - parseFloat(weight)), }