Make LuaTypes internal, and only return the actual values

Upsilon/BaseTypes/Number/Number.cs

@@ -1,6 +1,6 @@
 namespace Upsilon.BaseTypes.Number
 {
-    public abstract class Number : LuaType
+    internal abstract class Number : LuaType
     {
         protected abstract bool IsFloat { get; }
 

Upsilon/BaseTypes/Number/NumberDouble.cs

@@ -2,7 +2,7 @@ using System.Globalization;
 
 namespace Upsilon.BaseTypes.Number
 {
-    public class NumberDouble : Number
+    internal class NumberDouble : Number
     {
         public double Value { get; }
         protected override bool IsFloat { get; } = true;
@@ -27,5 +27,9 @@ namespace Upsilon.BaseTypes.Number
             return n.Value;
         }
 
+        public override object ToCSharpObject()
+        {
+            return Value;
+        }
     }
 }

Upsilon/BaseTypes/Number/NumberLong.cs

@@ -3,7 +3,7 @@ using System.Globalization;
 
 namespace Upsilon.BaseTypes.Number
 {
-    public class NumberLong : Number
+    internal class NumberLong : Number
     {
         public long Value { get; }
         protected override bool IsFloat { get; } = false;
@@ -29,5 +29,10 @@ namespace Upsilon.BaseTypes.Number
                 return 0;
             return n.Value;
         }
+
+        public override object ToCSharpObject()
+        {
+            return Value;
+        }
     }
 }