diff --git a/include/chaiscript/dispatchkit/boxed_number.hpp b/include/chaiscript/dispatchkit/boxed_number.hpp
index 795bac8f..4c082d63 100644
--- a/include/chaiscript/dispatchkit/boxed_number.hpp
+++ b/include/chaiscript/dispatchkit/boxed_number.hpp
@@ -296,19 +296,15 @@ namespace chaiscript
 
       
     public:
+      Boxed_Number()
+        : bv(Boxed_Value(0))
+      {
+      }
+
       Boxed_Number(const Boxed_Value &v)
         : bv(v)
       {
-        const Type_Info &inp_ = v.get_type_info();
-        if (inp_ == typeid(bool))
-        {
-          throw chaiscript::detail::exception::bad_any_cast();
-        }
-
-        if (!inp_.is_arithmetic())
-        {
-          throw chaiscript::detail::exception::bad_any_cast();
-        }
+        validate_boxed_number(v);
       }
 
 
@@ -377,6 +373,27 @@ namespace chaiscript
         return oper(Operators::assign_bitwise_and, this->bv, t_rhs.bv);
       }
 
+      void validate_boxed_number(const Boxed_Value &v)
+      {
+        const Type_Info &inp_ = v.get_type_info();
+        if (inp_ == typeid(bool))
+        {
+          throw chaiscript::detail::exception::bad_any_cast();
+        }
+
+        if (!inp_.is_arithmetic())
+        {
+          throw chaiscript::detail::exception::bad_any_cast();
+        }
+      }
+
+      Boxed_Number operator=(const Boxed_Value &v)
+      {
+        validate_boxed_number(v);
+        bv = v;
+        return *this;
+      }
+
       Boxed_Number operator=(const Boxed_Number &t_rhs) const
       {
         return oper(Operators::assign, this->bv, t_rhs.bv);
diff --git a/samples/example.cpp b/samples/example.cpp
index 9319d187..e5838b08 100644
--- a/samples/example.cpp
+++ b/samples/example.cpp
@@ -165,7 +165,7 @@ int main(int /*argc*/, char * /*argv*/[]) {
   //Dynamic objects test
   chai.add(chaiscript::Proxy_Function(new dispatch::detail::Dynamic_Object_Function("TestType", fun(&hello_world))), "hello_world");
   chai.add(chaiscript::Proxy_Function(new dispatch::detail::Dynamic_Object_Constructor("TestType", fun(&hello_constructor))), "TestType");
-  chai.add(fun(std::function<Boxed_Value (dispatch::Dynamic_Object &)>(std::bind(&dispatch::detail::Dynamic_Object_Attribute::func, "TestType", "attr", std::placeholders::_1))), "attr");
+//  chai.add(fun(std::function<Boxed_Value (dispatch::Dynamic_Object &)>(std::bind(&dispatch::detail::Dynamic_Object_Attribute::func, "TestType", "attr", std::placeholders::_1))), "attr");
 
   chai.eval("var x = TestType()");
 //  chai.eval("x.attr = \"hi\"");