`numbro.unformat` can't parse custom formats, such as postfixes

[sullvn]

unformat currently can't parse custom postfixes. And other custom formatting. Even if provided as a format object in the second parameter.

It looks like the format argument is part of the API, but not actually used. It is passed down from unformat eventually into computeUnformattedValue, but is not actually used there.

numbro/src/unformatting.js

Lines 246 to 253 in 0e58867

	/**
	* Unformat a numbro-generated string to retrieve the original value.
	*
	* @param {string} inputString - string to unformat
	* @param {NumbroFormat} format - format used while generating the inputString
	* @return {number}
	*/
	function unformat(inputString, format) {

Expected

const format = {  postfix: "test" };
const result = numbro.unformat(numbro(90).format(format), format)
expect(result).toBe(90)

Actual

The result is either NaN or undefined.