Do not sort when sort option is set to false (#155)

index.js

@@ -179,13 +179,19 @@ exports.stringify = (obj, options) => {
 
 	options = Object.assign(defaults, options);
 
-	if (options.sort === false) {
-		options.sort = () => {};
+	const formatter = encoderForArrayFormat(options);
+
+	if (!obj) {
+		return '';
 	}
 
-	const formatter = encoderForArrayFormat(options);
+	const keys = Object.keys(obj);
+
+	if (options.sort !== false) {
+		keys.sort(options.sort);
+	}
 
-	return obj ? Object.keys(obj).sort(options.sort).map(key => {
+	return keys.map(key => {
 		const value = obj[key];
 
 		if (value === undefined) {
@@ -211,7 +217,7 @@ exports.stringify = (obj, options) => {
 		}
 
 		return encode(key, options) + '=' + encode(value, options);
-	}).filter(x => x.length > 0).join('&') : '';
+	}).filter(x => x.length > 0).join('&');
 };
 
 exports.parseUrl = (input, options) => {

test/stringify.js

@@ -139,6 +139,24 @@ test('should sort keys in given order', t => {
 	t.is(m.stringify({a: 'foo', b: 'bar', c: 'baz'}, {sort}), 'c=baz&a=foo&b=bar');
 });
 
+test('should not sort when sort is false', t => {
+	const object = {
+		story: 'a',
+		patch: 'b',
+		deployment: 'c',
+		lat: 10,
+		lng: 20,
+		sb: 'd',
+		sc: 'e',
+		mn: 'f',
+		ln: 'g',
+		nf: 'h',
+		srs: 'i',
+		destination: 'g'
+	};
+	t.is(m.stringify(object, {sort: false}), 'story=a&patch=b&deployment=c&lat=10&lng=20&sb=d&sc=e&mn=f&ln=g&nf=h&srs=i&destination=g');
+});
+
 test('should disable sorting', t => {
 	t.is(m.stringify({
 		c: 'foo',