static _modifyNegativeSignAndDecimalCharacterForFormattedValue(s, settings) {
        //XXX Note; this function is static since we need to pass a `settings` object when calling the static `AutoNumeric.format()` method
        if (settings.negativeSignCharacter !== '-') {
            s = s.replace('-', settings.negativeSignCharacter);
        }

        if (settings.decimalCharacter !== '.') {
            s = s.replace('.', settings.decimalCharacter);
        }

        return s;
    }
Modify the negative sign and the decimal character to use those defined in the settings.

@param {string} s
@param {object} settings
@returns {string}