Fixes for function execution when parameter is not bound

UpsilonTests/GeneralTests/UserDataTests.cs

@@ -43,6 +43,16 @@ namespace UpsilonTests.GeneralTests
                 return a + b;
             }
 
+            public bool OverloadMethod(string s)
+            {
+                return s == "test";
+            }
+
+            public int OverloadMethod(int i)
+            {
+                return i + 10;
+            }
+
         }
         #pragma warning restore 414, 649
 
@@ -136,6 +146,20 @@ end
             Assert.False(obj.PrivateSet);
         }
 
+        [Fact]
+        public void OverloadMethods()
+        {
+            var obj = new UserDataHelper();
+            const string input = @"
+function test(o)
+    return o.overloadMethod(""test"") and o.OverloadMethod(10) == 20
+end
+";
+            Assert.True(Executor.EvaluateFunction<bool>(input, "test", new[] {obj}, Options));
+        }
+
+
+
         public UserDataTests(StaticScriptFixture fix) : base(fix)
         {
         }