Fix broken setOption & add unit test

build/cjs.js

@@ -1272,10 +1272,10 @@ Constraint = function (value, options) {
 			this._options[arg0] = arg1;
 			to_invalidate = indexOf(invalidation_arguments, arg0) >= 0;
 		} else {
-			var keys = keys(arg0);
+			var arg0_keys = keys(arg0);
 			extend(this._options, arg0);
 			to_invalidate = any(invalidation_arguments, function(ia) {
-				return keys.indexOf(ia) >= 0;
+				return arg0_keys.indexOf(ia) >= 0;
 			});
 		}
 

src/core.js

@@ -627,10 +627,10 @@ Constraint = function (value, options) {
 			this._options[arg0] = arg1;
 			to_invalidate = indexOf(invalidation_arguments, arg0) >= 0;
 		} else {
-			var keys = keys(arg0);
+			var arg0_keys = keys(arg0);
 			extend(this._options, arg0);
 			to_invalidate = any(invalidation_arguments, function(ia) {
-				return keys.indexOf(ia) >= 0;
+				return arg0_keys.indexOf(ia) >= 0;
 			});
 		}
 

test/unit_tests/constraint_test.js

@@ -265,3 +265,21 @@ dt("Nullify check infinite loop", 4, function() {
 	y.set(function(){return z.get()+1});
 	equal(z.get(), 1);
 });
+
+dt("Set Option", 3, function() {
+    var f = function(){
+        return 1;
+    }
+    var x = cjs(f);
+
+    equal(x.get(), 1);
+
+    x.setOption({ literal: true });
+    equal(x.get(), f);
+
+    x.setOption({ literal: false });
+    equal(x.get(), 1);
+
+    x.destroy();
+    x = null;
+});