Fix bug4

.js

@@ -0,0 +1,19 @@
+const queryString = require('./index');
+
+// Example data that includes null and empty strings
+const params = {
+    list: ['item', '', null, 'last']
+};
+
+// Options to reproduce the bug
+const options = {
+    arrayFormat: 'comma',
+    skipNull: false,
+    skipEmptyString: false
+};
+
+// Stringify the parameters with the options
+const result = queryString.stringify(params, options);
+
+// Log the result to console
+console.log(result); // Expected to incorrectly skip null and empty strings based on the bug

index.js

@@ -1,3 +1,3 @@
 import * as queryString from './base.js';
-
 export default queryString;
+

test/parse.js

@@ -310,6 +310,33 @@
 	t.deepEqual(queryString.stringify(queryString.parse(original, options), options), sortedOriginal);
 });
 
+test('circuit parse → stringify with array commas', t => {
+	const original = 'c=,a,,&b=&a=';
+	const sortedOriginal = 'a=&b=&c=,a,,';
+	const expected = {
+		c: ['', 'a', '', ''],
+		b: '',
+		a: ''
+	};
+	const options = {
+		arrayFormat: 'comma'
+	};
+
+	t.deepEqual(queryString.parse(original, options), expected);
+
+	t.is(queryString.stringify(expected, options), sortedOriginal);
+});
+
+test('circuit original → parse → stringify with array commas → sorted original', t => {
+	const original = 'c=,a,,&b=&a=';
+	const sortedOriginal = 'a=&b=&c=,a,,';
+	const options = {
+		arrayFormat: 'comma'
+	};
+
+	t.deepEqual(queryString.stringify(queryString.parse(original, options), options), sortedOriginal);
+});
+
 test('decode keys and values', t => {
 	t.deepEqual(queryString.parse('st%C3%A5le=foo'), {ståle: 'foo'});
 	t.deepEqual(queryString.parse('foo=%7B%ab%%7C%de%%7D+%%7Bst%C3%A5le%7D%'), {foo: '{%ab%|%de%} %{ståle}%'});

test/stringify.js

@@ -133,6 +133,18 @@
 	}), 'bar=one,two&foo');
 });
 
+test('array stringify representation with array commas and null/empty values', t => {
+    const result = queryString.stringify({
+        list: ['item', null, 'last', '']
+    }, {
+        arrayFormat: 'comma',
+        skipNull: false,
+        skipEmptyString: false
+    });
+
+    t.is(result, 'list=item,,last,');
+});
+
 test('array stringify representation with array commas, null & empty string', t => {
 	t.is(queryString.stringify({
 		c: [null, 'a', '', null],