unformatOther(stringOrElement, optionOverride = null) { //FIXME test this
        return this._formatOrUnformatOther(false, stringOrElement, optionOverride);
    }
Unformat and return the raw numeric string corresponding to the given value, or directly set the unformatted value into the given DOM element if one is passed as an argument.
By default, this use the current element settings.
The user can override any option of its choosing by passing an option object.
@param {string|HTMLElement|HTMLInputElement} stringOrElement
@param {null|object} optionOverride
@returns {string|null}