Function compareNumeric

packages/intl-collator/compare.ts:466–514

(
  left: string,
  right: string,
  slots: IntlCollatorInternal
)

}

function compareNumeric(
  left: string,
  right: string,
  slots: IntlCollatorInternal
): number {
  // ECMA-402 numeric=true / Unicode extension kn=true compares digit runs by
  // numeric value instead of lexical code unit order.
  // https://tc39.es/ecma402/#sec-initializecollator
  const leftParts = left.split(ASCII_DIGIT_RUN)
  const rightParts = right.split(ASCII_DIGIT_RUN)
  const leftDigits = left.match(ASCII_DIGIT_RUN) || []
  const rightDigits = right.match(ASCII_DIGIT_RUN) || []
  const length = Math.max(leftParts.length, rightParts.length)

  for (let i = 0; i < length; i++) {
    const partResult = comparePreparedStrings(
      leftParts[i] || '',
      rightParts[i] || '',
      slots
    )
    if (partResult) {
      return partResult
    }

    const leftNumber = leftDigits[i]
    const rightNumber = rightDigits[i]
    if (leftNumber === undefined || rightNumber === undefined) {
      continue
    }

    const normalizedLeftNumber = leftNumber.replace(LEADING_ZERO_RE, '') || '0'
    const normalizedRightNumber =
      rightNumber.replace(LEADING_ZERO_RE, '') || '0'
    const lengthResult =
      normalizedLeftNumber.length - normalizedRightNumber.length
    if (lengthResult) {
      return lengthResult < 0 ? -1 : 1
    }
    const digitResult = compareStrings(
      normalizedLeftNumber,
      normalizedRightNumber
    )
    if (digitResult) {
      return digitResult
    }
  }

  return 0
}

function compareCaseFirst(
  left: string,