Allow parameter overloading script functions

UpsilonTests/GeneralTests/FunctionTests.cs

@@ -182,5 +182,23 @@ return value
             var result = Executor.EvaluateScript<long>(input, Options);
             Assert.Equal(6, result);
         }
+
+        [Fact]
+        public void HandleMultipleFunctionOptions()
+        {
+            const string input = @"
+function a(number v)
+    return v + 10
+end
+function a(string s)
+    return s == ""test""
+end
+
+return a(50) == 60 and a(""test"")
+";
+            Assert.Equal(60, Executor.EvaluateFunction<long>(input, "a", new object[] {50}));
+            Assert.True(Executor.EvaluateFunction<bool>(input, "a", new object[] {"test"}));
+            Assert.True(Executor.EvaluateScript<bool>(input, Options));
+        }
     }
 }