Use custom object formatters for any part of a diff, not just leaf nodes

src/core/matchers/ObjectPath.js

@@ -11,10 +11,24 @@ getJasmineRequireObj().ObjectPath = function(j$) {
     }
   };
 
+  ObjectPath.prototype.dereference = function(obj) {
+    var i;
+
+    for (i = 0; i < this.components.length; i++) {
+      obj = obj[this.components[i]];
+    }
+
+    return obj;
+  };
+
   ObjectPath.prototype.add = function(component) {
     return new ObjectPath(this.components.concat([component]));
   };
 
+  ObjectPath.prototype.shift = function() {
+    return new ObjectPath(this.components.slice(1));
+  };
+
   ObjectPath.prototype.depth = function() {
     return this.components.length;
   };