Fix #237: Use jQuery#is() for jQuery equality

In f1a1f30 we added support for
[Javascript iteraction protocols][0].

jQuery objects happen to have iteration protocols, so they would trigger
the new codepath. However, that code path uses `Array.from` on the
input, which doesn't play nice with jQuery's serializer.

Luckily, [jQuery has the `is()` method for comparing its objects][1].

[0]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
[1]: https://api.jquery.com/is/

lib/deep-equal.js

@@ -191,6 +191,19 @@ function deepEqualCyclic(actual, expectation, match) {
             return mapsDeeplyEqual;
         }
 
+        // jQuery objects have iteration protocols
+        // see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
+        // But, they don't work well with the implementation concerning iterables below,
+        // so we will detect them and use jQuery's own equality function
+        /* istanbul ignore next -- this can only be tested in the `test-headless` script */
+        if (
+            actualObj.constructor &&
+            actualObj.constructor.name === "jQuery" &&
+            typeof actualObj.is === "function"
+        ) {
+            return actualObj.is(expectationObj);
+        }
+
         var isActualNonArrayIterable =
             isIterable(actualObj) &&
             !isArrayType(actualObj) &&