static fromFormatExplain(text, fmt, options = {}) {
    const { locale = null, numberingSystem = null } = options,
      localeToUse = Locale.fromOpts({
        locale,
        numberingSystem,
        defaultToEN: true,
      });
    return explainFromTokens(localeToUse, text, fmt);
  }
Explain how a string would be parsed by fromFormat()
@param {string} text - the string to parse
@param {string} fmt - the format the string is expected to be in (see description)
@param {Object} options - options taken by fromFormat()
@return {Object}