diff --git a/include/chaiscript/dispatchkit/boxed_cast.hpp b/include/chaiscript/dispatchkit/boxed_cast.hpp
index e172d32..b2fd0d7 100644
--- a/include/chaiscript/dispatchkit/boxed_cast.hpp
+++ b/include/chaiscript/dispatchkit/boxed_cast.hpp
@@ -68,7 +68,7 @@ namespace chaiscript
   /// assert(i == 5);
   /// \endcode
   template<typename Type>
-  typename detail::Cast_Helper<Type>::Result_Type boxed_cast(const Boxed_Value &bv, const Dynamic_Cast_Conversions &t_conversions = Dynamic_Cast_Conversions())
+  typename detail::Cast_Helper<Type>::Result_Type boxed_cast(const Boxed_Value &bv, const Dynamic_Cast_Conversions *t_conversions = 0)
   {
     try {
       return detail::Cast_Helper<Type>::cast(bv, t_conversions);
@@ -81,12 +81,12 @@ namespace chaiscript
 #pragma warning(disable : 4127)
 #endif
 
-      if (boost::is_polymorphic<typename detail::Stripped_Type<Type>::type>::value)
+      if (boost::is_polymorphic<typename detail::Stripped_Type<Type>::type>::value && t_conversions)
       {
         try {
           // We will not catch any bad_boxed_dynamic_cast that is thrown, let the user get it
           // either way, we are not responsible if it doesn't work
-          return detail::Cast_Helper<Type>::cast(t_conversions.boxed_dynamic_cast<Type>(bv), t_conversions);
+          return detail::Cast_Helper<Type>::cast(t_conversions->boxed_dynamic_cast<Type>(bv), t_conversions);
         } catch (const boost::bad_any_cast &) {
           throw exception::bad_boxed_cast(bv.get_type_info(), typeid(Type));
         }
diff --git a/include/chaiscript/dispatchkit/boxed_cast_helper.hpp b/include/chaiscript/dispatchkit/boxed_cast_helper.hpp
index 8c9ed44..54bb90d 100644
--- a/include/chaiscript/dispatchkit/boxed_cast_helper.hpp
+++ b/include/chaiscript/dispatchkit/boxed_cast_helper.hpp
@@ -31,7 +31,7 @@ namespace chaiscript
       {
         typedef typename boost::reference_wrapper<typename boost::add_const<Result>::type > Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           if (ob.is_ref())
           {
@@ -73,7 +73,7 @@ namespace chaiscript
       {
         typedef const Result * Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           if (ob.is_ref())
           {
@@ -102,7 +102,7 @@ namespace chaiscript
       {
         typedef Result * Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           if (ob.is_ref())
           {
@@ -121,7 +121,7 @@ namespace chaiscript
       {
         typedef typename boost::reference_wrapper<Result> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           if (ob.is_ref())
           {
@@ -140,7 +140,7 @@ namespace chaiscript
       {
         typedef typename boost::shared_ptr<Result> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           return boost::any_cast<boost::shared_ptr<Result> >(ob.get());
         }
@@ -154,7 +154,7 @@ namespace chaiscript
       {
         typedef typename boost::shared_ptr<const Result> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           if (!ob.get_type_info().is_const())
           {
@@ -202,7 +202,7 @@ namespace chaiscript
       {
         typedef const Boxed_Value & Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           return ob;    
         }
@@ -263,7 +263,7 @@ namespace chaiscript
       {
         typedef typename Cast_Helper_Inner<T>::Result_Type Result_Type;
         
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &t_conversions)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *t_conversions)
         {
           return Cast_Helper_Inner<T>::cast(ob, t_conversions);
         }
diff --git a/include/chaiscript/dispatchkit/boxed_number.hpp b/include/chaiscript/dispatchkit/boxed_number.hpp
index 07522cd..dccd460 100644
--- a/include/chaiscript/dispatchkit/boxed_number.hpp
+++ b/include/chaiscript/dispatchkit/boxed_number.hpp
@@ -820,7 +820,7 @@ namespace chaiscript
       {
         typedef Boxed_Number Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
         {
           return Boxed_Number(ob);
         }
diff --git a/include/chaiscript/dispatchkit/dispatchkit.hpp b/include/chaiscript/dispatchkit/dispatchkit.hpp
index c67f24a..7a42aef 100644
--- a/include/chaiscript/dispatchkit/dispatchkit.hpp
+++ b/include/chaiscript/dispatchkit/dispatchkit.hpp
@@ -395,7 +395,7 @@ namespace chaiscript
         template<typename Type>
           typename detail::Cast_Helper<Type>::Result_Type boxed_cast(const Boxed_Value &bv) const
           {
-            return chaiscript::boxed_cast<Type>(bv, m_conversions);
+            return chaiscript::boxed_cast<Type>(bv, &m_conversions);
           }
 
         /**
diff --git a/include/chaiscript/dispatchkit/dynamic_cast_conversion.hpp b/include/chaiscript/dispatchkit/dynamic_cast_conversion.hpp
index 7de42bd..841136c 100644
--- a/include/chaiscript/dispatchkit/dynamic_cast_conversion.hpp
+++ b/include/chaiscript/dispatchkit/dynamic_cast_conversion.hpp
@@ -91,7 +91,7 @@ namespace chaiscript
               if (t_derived.is_const())
               {
                 boost::shared_ptr<const Base> data 
-                  = boost::dynamic_pointer_cast<const Base>(detail::Cast_Helper<boost::shared_ptr<const Derived> >::cast(t_derived, Dynamic_Cast_Conversions()));
+                  = boost::dynamic_pointer_cast<const Base>(detail::Cast_Helper<boost::shared_ptr<const Derived> >::cast(t_derived, 0));
                 if (!data)
                 {
                   throw std::bad_cast();
@@ -100,7 +100,7 @@ namespace chaiscript
                 return Boxed_Value(data);
               } else {
                 boost::shared_ptr<Base> data 
-                  = boost::dynamic_pointer_cast<Base>(detail::Cast_Helper<boost::shared_ptr<Derived> >::cast(t_derived, Dynamic_Cast_Conversions()));
+                  = boost::dynamic_pointer_cast<Base>(detail::Cast_Helper<boost::shared_ptr<Derived> >::cast(t_derived, 0));
 
                 if (!data)
                 {
@@ -113,11 +113,11 @@ namespace chaiscript
               // Pull the reference out of the contained boxed value, which we know is the type we want
               if (t_derived.is_const())
               {
-                const Derived &d = detail::Cast_Helper<const Derived &>::cast(t_derived, Dynamic_Cast_Conversions());
+                const Derived &d = detail::Cast_Helper<const Derived &>::cast(t_derived, 0);
                 const Base &data = dynamic_cast<const Base &>(d);
                 return Boxed_Value(boost::cref(data));
               } else {
-                Derived &d = detail::Cast_Helper<Derived &>::cast(t_derived, Dynamic_Cast_Conversions());
+                Derived &d = detail::Cast_Helper<Derived &>::cast(t_derived, 0);
                 Base &data = dynamic_cast<Base &>(d);
                 return Boxed_Value(boost::ref(data));
               }
diff --git a/include/chaiscript/dispatchkit/function_call.hpp b/include/chaiscript/dispatchkit/function_call.hpp
index 3316c54..69282cb 100644
--- a/include/chaiscript/dispatchkit/function_call.hpp
+++ b/include/chaiscript/dispatchkit/function_call.hpp
@@ -32,7 +32,7 @@ namespace chaiscript
      */
     template<typename FunctionType>
       boost::function<FunctionType>
-      functor(const std::vector<Const_Proxy_Function> &funcs, const Dynamic_Cast_Conversions &t_conversions)
+      functor(const std::vector<Const_Proxy_Function> &funcs, const Dynamic_Cast_Conversions *t_conversions)
       {
         FunctionType *p=0;
         return detail::build_function_caller_helper(p, funcs, t_conversions);
@@ -53,7 +53,7 @@ namespace chaiscript
      */
     template<typename FunctionType>
       boost::function<FunctionType>
-      functor(Const_Proxy_Function func, const Dynamic_Cast_Conversions &t_conversions)
+      functor(Const_Proxy_Function func, const Dynamic_Cast_Conversions *t_conversions)
       {
         std::vector<Const_Proxy_Function> funcs;
         funcs.push_back(func);
@@ -66,7 +66,7 @@ namespace chaiscript
      */
     template<typename FunctionType>
       boost::function<FunctionType>
-      functor(const Boxed_Value &bv, const Dynamic_Cast_Conversions &t_conversions)
+      functor(const Boxed_Value &bv, const Dynamic_Cast_Conversions *t_conversions)
       {
         return functor<FunctionType>(boxed_cast<Const_Proxy_Function >(bv, t_conversions), t_conversions);
       }
@@ -81,7 +81,7 @@ namespace chaiscript
       {
         typedef boost::function<Signature> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &t_conversions)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *t_conversions)
         {
           if (ob.get_type_info().bare_equal(user_type<Const_Proxy_Function>()))
           {
@@ -100,7 +100,7 @@ namespace chaiscript
       {
         typedef boost::function<Signature> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &t_conversions)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *t_conversions)
         {
           if (ob.get_type_info().bare_equal(user_type<Const_Proxy_Function>()))
           {
@@ -119,7 +119,7 @@ namespace chaiscript
       {
         typedef boost::function<Signature> Result_Type;
 
-        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions &t_conversions)
+        static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *t_conversions)
         {
           if (ob.get_type_info().bare_equal(user_type<Const_Proxy_Function>()))
           {
diff --git a/include/chaiscript/dispatchkit/function_call_detail.hpp b/include/chaiscript/dispatchkit/function_call_detail.hpp
index f62ea01..7d68915 100644
--- a/include/chaiscript/dispatchkit/function_call_detail.hpp
+++ b/include/chaiscript/dispatchkit/function_call_detail.hpp
@@ -81,9 +81,9 @@ namespace chaiscript
         {
           std::vector<Boxed_Value> params;
 
-          BOOST_PP_REPEAT(n, addparam, ~)
+          BOOST_PP_REPEAT(n, addparam, ~);
 
-            return Function_Caller_Ret<Ret>::call(funcs, params, t_conversions);
+          return Function_Caller_Ret<Ret>::call(funcs, params, t_conversions);
         }
 
       /**
@@ -92,7 +92,7 @@ namespace chaiscript
       template<typename Ret BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n, typename Param) >
         boost::function<Ret (BOOST_PP_ENUM_PARAMS(n, Param)) > 
         build_function_caller_helper(Ret (BOOST_PP_ENUM_PARAMS(n, Param)), const std::vector<Const_Proxy_Function> &funcs, 
-            const Dynamic_Cast_Conversions &t_conversions)
+            const Dynamic_Cast_Conversions *t_conversions)
         {
           if (funcs.size() == 1)
           {
@@ -108,7 +108,7 @@ namespace chaiscript
             // we cannot make any other guesses or assumptions really, so continuing
           }
 
-          return boost::bind(&function_caller<Ret BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n, Param)>, funcs, t_conversions
+          return boost::bind(&function_caller<Ret BOOST_PP_COMMA_IF(n) BOOST_PP_ENUM_PARAMS(n, Param)>, funcs, (t_conversions?*t_conversions:Dynamic_Cast_Conversions())
               BOOST_PP_ENUM_TRAILING(n, curry, ~));
         }
     }
diff --git a/include/chaiscript/dispatchkit/proxy_functions.hpp b/include/chaiscript/dispatchkit/proxy_functions.hpp
index 2df8a23..272b7c1 100644
--- a/include/chaiscript/dispatchkit/proxy_functions.hpp
+++ b/include/chaiscript/dispatchkit/proxy_functions.hpp
@@ -574,10 +574,10 @@ namespace chaiscript
             const Boxed_Value &bv = params[0];
             if (bv.is_const())
             {
-              const Class *o = boxed_cast<const Class *>(bv, t_conversions);
+              const Class *o = boxed_cast<const Class *>(bv, &t_conversions);
               return detail::Handle_Return<typename boost::add_reference<T>::type>::handle(o->*m_attr);
             } else {
-              Class *o = boxed_cast<Class *>(bv, t_conversions);
+              Class *o = boxed_cast<Class *>(bv, &t_conversions);
               return detail::Handle_Return<typename boost::add_reference<T>::type>::handle(o->*m_attr);
             }
           } else {
diff --git a/include/chaiscript/dispatchkit/proxy_functions_detail.hpp b/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
index 3c5f480..4494193 100644
--- a/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
+++ b/include/chaiscript/dispatchkit/proxy_functions_detail.hpp
@@ -7,8 +7,8 @@
 #include <boost/preprocessor.hpp>
 
 #define gettypeinfo(z,n,text)  ti.push_back(chaiscript::detail::Get_Type_Info<Param ## n>::get());
-#define casthelper(z,n,text) BOOST_PP_COMMA_IF(n) chaiscript::boxed_cast< Param ## n >(params[n], t_conversions)
-#define trycast(z,n,text) chaiscript::boxed_cast<Param ## n>(params[n], t_conversions);
+#define casthelper(z,n,text) BOOST_PP_COMMA_IF(n) chaiscript::boxed_cast< Param ## n >(params[n], &t_conversions)
+#define trycast(z,n,text) chaiscript::boxed_cast<Param ## n>(params[n], &t_conversions);
 
 #ifndef  BOOST_PP_IS_ITERATING
 #ifndef CHAISCRIPT_PROXY_FUNCTIONS_DETAIL_HPP_