diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index bc58a8a5c5..4b92739909 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -5614,12 +5614,13 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                                 if (remain < 6)
                                     return;
 
-                                face = Convert.ToInt32(rules.Data[idx++].ToString()); // holeshape
-                                v = new LSL_Types.Vector3(rules.Data[idx++].ToString()); // cut
-                                hollow = (float)Convert.ToDouble(rules.Data[idx++].ToString());
-                                twist = new LSL_Types.Vector3(rules.Data[idx++].ToString());
-                                taper_b = new LSL_Types.Vector3(rules.Data[idx++].ToString());
-                                topshear = new LSL_Types.Vector3(rules.Data[idx++].ToString());
+                                face = (int)rules.GetLSLIntegerItem(idx++);
+                                v = rules.GetVector3Item(idx++); // cut
+                                hollow = (float)rules.GetLSLFloatItem(idx++);
+                                twist = rules.GetVector3Item(idx++);
+                                taper_b = rules.GetVector3Item(idx++);
+                                topshear = rules.GetVector3Item(idx++);
+
                                 part.Shape.PathCurve = (byte)Extrusion.Straight;
                                 SetPrimitiveShapeParams(part, face, v, hollow, twist, taper_b, topshear, 1);
                                 break;
diff --git a/OpenSim/Region/ScriptEngine/Shared/LSL_Types.cs b/OpenSim/Region/ScriptEngine/Shared/LSL_Types.cs
index 4554b0c9e3..f149f60472 100644
--- a/OpenSim/Region/ScriptEngine/Shared/LSL_Types.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/LSL_Types.cs
@@ -454,7 +454,12 @@ namespace OpenSim.Region.ScriptEngine.Shared
 
             public LSL_Types.LSLInteger GetLSLIntegerItem(int itemIndex)
             {
-              return (LSL_Types.LSLInteger)m_data[itemIndex];
+              if (m_data[itemIndex] is LSL_Types.LSLInteger)
+                  return (LSL_Types.LSLInteger)m_data[itemIndex];
+              else if (m_data[itemIndex] is Int32)
+                  return new LSLInteger((int)m_data[itemIndex]);
+              else
+                  throw new InvalidCastException();
             }
 
             public LSL_Types.Vector3 GetVector3Item(int itemIndex)
diff --git a/OpenSim/Tests/Region/ScriptEngine/Shared/LSL_TypesTestList.cs b/OpenSim/Tests/Region/ScriptEngine/Shared/LSL_TypesTestList.cs
index ca59c97eff..7da28ddf6c 100644
--- a/OpenSim/Tests/Region/ScriptEngine/Shared/LSL_TypesTestList.cs
+++ b/OpenSim/Tests/Region/ScriptEngine/Shared/LSL_TypesTestList.cs
@@ -44,18 +44,18 @@ namespace OpenSim.Region.ScriptEngine.Shared.Tests
         [Test]
         public void TestConcatenateString()
         {
-            LSL_Types.list testList = new LSL_Types.list(1, 'a', "test");
-            testList += "addition";
+            LSL_Types.list testList = new LSL_Types.list(new LSL_Types.LSLInteger(1), new LSL_Types.LSLInteger('a'), new LSL_Types.LSLString("test"));
+            testList += new LSL_Types.LSLString("addition");
 
             Assert.AreEqual(4, testList.Length);
-            Assert.AreEqual("addition", testList.Data[3]);
-            Assert.AreEqual(typeof(System.String), testList.Data[3].GetType());
+            Assert.AreEqual(new LSL_Types.LSLString("addition"), testList.Data[3]);
+            Assert.AreEqual(typeof(LSL_Types.LSLString), testList.Data[3].GetType());
 
-            LSL_Types.list secondTestList = testList + "more";
+            LSL_Types.list secondTestList = testList + new LSL_Types.LSLString("more");
 
             Assert.AreEqual(5, secondTestList.Length);
-            Assert.AreEqual("more", secondTestList.Data[4]);
-            Assert.AreEqual(typeof(System.String), secondTestList.Data[4].GetType());
+            Assert.AreEqual(new LSL_Types.LSLString("more"), secondTestList.Data[4]);
+            Assert.AreEqual(typeof(LSL_Types.LSLString), secondTestList.Data[4].GetType());
         }
 
         /// <summary>
@@ -64,38 +64,38 @@ namespace OpenSim.Region.ScriptEngine.Shared.Tests
         [Test]
         public void TestConcatenateInteger()
         {
-            LSL_Types.list testList = new LSL_Types.list(1, 'a', "test");
-            testList += 20;
+            LSL_Types.list testList = new LSL_Types.list(new LSL_Types.LSLInteger(1), new LSL_Types.LSLInteger('a'), new LSL_Types.LSLString("test"));
+            testList += new LSL_Types.LSLInteger(20);
 
             Assert.AreEqual(4, testList.Length);
-            Assert.AreEqual(20, testList.Data[3]);
-            Assert.AreEqual(typeof(int), testList.Data[3].GetType());
+            Assert.AreEqual(new LSL_Types.LSLInteger(20), testList.Data[3]);
+            Assert.AreEqual(typeof(LSL_Types.LSLInteger), testList.Data[3].GetType());
 
-            LSL_Types.list secondTestList = testList + 2;
+            LSL_Types.list secondTestList = testList + new LSL_Types.LSLInteger(2);
 
             Assert.AreEqual(5, secondTestList.Length);
-            Assert.AreEqual(2, secondTestList.Data[4]);
-            Assert.AreEqual(typeof(int), secondTestList.Data[4].GetType());
+            Assert.AreEqual(new LSL_Types.LSLInteger(2), secondTestList.Data[4]);
+            Assert.AreEqual(typeof(LSL_Types.LSLInteger), secondTestList.Data[4].GetType());
         }
 
         /// <summary>
-        /// Tests concatenating a double to a list.
+        /// Tests concatenating a float to a list.
         /// </summary>
         [Test]
         public void TestConcatenateDouble()
         {
-          LSL_Types.list testList = new LSL_Types.list(1, 'a', "test");
-          testList += 2.0;
+            LSL_Types.list testList = new LSL_Types.list(new LSL_Types.LSLInteger(1), new LSL_Types.LSLInteger('a'), new LSL_Types.LSLString("test"));
+          testList += new LSL_Types.LSLFloat(2.0f);
 
           Assert.AreEqual(4, testList.Length);
-          Assert.AreEqual(2.0, testList.Data[3]);
-          Assert.AreEqual(typeof(double), testList.Data[3].GetType());
+          Assert.AreEqual(new LSL_Types.LSLFloat(2.0f), testList.Data[3]);
+          Assert.AreEqual(typeof(LSL_Types.LSLFloat), testList.Data[3].GetType());
 
-          LSL_Types.list secondTestList = testList + 0.04;
+          LSL_Types.list secondTestList = testList + new LSL_Types.LSLFloat(0.04f);
 
           Assert.AreEqual(5, secondTestList.Length);
-          Assert.AreEqual(0.04, secondTestList.Data[4]);
-          Assert.AreEqual(typeof(double), secondTestList.Data[4].GetType());
+          Assert.AreEqual(new LSL_Types.LSLFloat(0.04f), secondTestList.Data[4]);
+          Assert.AreEqual(typeof(LSL_Types.LSLFloat), secondTestList.Data[4].GetType());
         }
 
         /// <summary>