json deserialize: check for instances of Array and Object

Similarly to #1351, we want
to run instance checks on JS Array and Object.

This patch relates to #1347.

Author: andreastt

index.html

@@ -5830,8 +5830,8 @@ <h3>Executing Script</h3>
    <dd><p>Return the <a data-lt="deserialize a web element">deserialized</a>
     <a>web element</a> of <var>value</var>.
 
-   <dt>type <a>Array</a>
-   <dt>type <a>Object</a>
+   <dt>instance of <a>Array</a>
+   <dt>instance of <a>Object</a>
    <dd><p>Return the result of running the <a>clone an object</a> algorithm
     with arguments <var>value</var> and <var>seen</var>,
     and the <a>JSON deserialize</a> algorithm as the clone algorithm.