Support older browsers.

Author: dougluce

lib/eql.js

@@ -21,6 +21,20 @@ catch(ex) {
   Buffer.isBuffer = function() { return false; }
 }
 
+/*!
+ * For browsers that don't support Object.getPrototypeOf (IE8?)
+ */
+
+function _getProto(object) {
+  if (typeof Object.getPrototypeOf === 'function') {
+    return Object.getPrototypeOf(object);
+  } else if (''.__proto__ === String.prototype) {
+    return object.__proto__;
+  } else {
+    return object.constructor.prototype;
+  }
+}
+
 /*!
  * Primary Export
  */
@@ -213,7 +227,7 @@ function objectEqual(a, b, m) {
     return false;
   }
 
-  if (Object.getPrototypeOf(a) !== Object.getPrototypeOf(b)) {
+  if (_getProto(a) !== _getProto(b)) {
     return false;
   }