function _extractFormattedDigitsAndPlus(text) {
	// Extract a formatted phone number part from text.
	const extractedNumber = extractFormattedPhoneNumber(text) || ''
	// Trim a `+`.
	if (extractedNumber[0] === '+') {
		return [extractedNumber.slice('+'.length), true]
	}
	return [extractedNumber]
}
Extracts formatted phone number digits (and a `+`) from text (if there're any).
@param  {string} text
@return {any[]}