How to use the @phensley/decimal.Chars.DIGIT9 function in @phensley/decimal

export const fastFormatDecimal = (n: string, digits: string[], minInt: number): string => {
  let r = '';
  const len = n.length;
  for (let i = 0; i < len; i++) {
    const c = n.charCodeAt(i);
    switch (c) {
      case Chars.DIGIT0:
      case Chars.DIGIT1:
      case Chars.DIGIT2:
      case Chars.DIGIT3:
      case Chars.DIGIT4:
      case Chars.DIGIT5:
      case Chars.DIGIT6:
      case Chars.DIGIT7:
      case Chars.DIGIT8:
      case Chars.DIGIT9:
        r += digits[c - Chars.DIGIT0];
        break;
    }
  }
  // Left pad zeros if minimum integer digits > formatted length
  let diff = minInt - r.length;
  if (diff > 0) {
    let p = '';
    while (diff-- > 0) {
      p += digits[0];
    }
    return p + r;
  }
  return r;
};