diff --git a/include/chaiscript/dispatchkit/boxed_number.hpp b/include/chaiscript/dispatchkit/boxed_number.hpp
index 7a7c875..68b2f0b 100644
--- a/include/chaiscript/dispatchkit/boxed_number.hpp
+++ b/include/chaiscript/dispatchkit/boxed_number.hpp
@@ -585,6 +585,59 @@ namespace chaiscript
 
       }
 
+      template<typename Source, typename Target> 
+      static void check_type()
+      {
+        if (sizeof(Source) != sizeof(Target)
+            || std::is_signed<Source>() != std::is_signed<Target>()
+            || std::is_floating_point<Source>() != std::is_floating_point<Target>())
+        {
+          throw chaiscript::detail::exception::bad_any_cast();
+        }
+      }
+
+      template<typename Target> Target get_as_checked() const
+      {
+        switch (get_common_type(bv)) {
+          case Common_Types::t_int32:
+            check_type<int32_t, Target>();
+            return get_as_aux<Target, int32_t>(bv);
+          case Common_Types::t_uint8:
+            check_type<uint8_t, Target>();
+            return get_as_aux<Target, uint8_t>(bv);
+          case Common_Types::t_int8:
+            check_type<int8_t, Target>();
+            return get_as_aux<Target, int8_t>(bv);
+          case Common_Types::t_uint16:
+            check_type<uint16_t, Target>();
+            return get_as_aux<Target, uint16_t>(bv);
+          case Common_Types::t_int16:
+            check_type<int16_t, Target>();
+            return get_as_aux<Target, int16_t>(bv);
+          case Common_Types::t_uint32:
+            check_type<uint32_t, Target>();
+            return get_as_aux<Target, uint32_t>(bv);
+          case Common_Types::t_uint64:
+            check_type<uint64_t, Target>();
+            return get_as_aux<Target, uint64_t>(bv);
+          case Common_Types::t_int64:
+            check_type<int64_t, Target>();
+            return get_as_aux<Target, int64_t>(bv);
+          case Common_Types::t_double:
+            check_type<double, Target>();
+            return get_as_aux<Target, double>(bv);
+          case Common_Types::t_float:
+            check_type<float, Target>();
+            return get_as_aux<Target, float>(bv);
+          case Common_Types::t_long_double:
+            check_type<long double, Target>();
+            return get_as_aux<Target, long double>(bv);
+        }
+
+        throw chaiscript::detail::exception::bad_any_cast();
+      }
+
+
       template<typename Target> Target get_as() const
       {
         switch (get_common_type(bv)) {
diff --git a/unittests/integer_literal_test.cpp b/unittests/integer_literal_test.cpp
index 4c20f28..9ac8808 100644
--- a/unittests/integer_literal_test.cpp
+++ b/unittests/integer_literal_test.cpp
@@ -19,7 +19,7 @@ bool test_literal(T val, const std::string &str, bool use_boxed_number = false)
     if (!use_boxed_number) {
       return chai.eval<T>(str);
     } else {
-      return chai.eval<chaiscript::Boxed_Number>(str).get_as<T>();
+      return chai.eval<chaiscript::Boxed_Number>(str).get_as_checked<T>();
     }
   }();
 
@@ -126,66 +126,66 @@ int main()
       && test_literal(0x7FFFFFFFFFFFFFFF, "0b111111111111111111111111111111111111111111111111111111111111111")
 
 
-      && TEST_LITERAL(-0xF)
-      && TEST_LITERAL(-0xFF)
-      && TEST_LITERAL(-0xFFF)
-      && TEST_LITERAL(-0xFFFF)
-      && TEST_LITERAL(-0xFFFFF)
-      && TEST_LITERAL(-0xFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFFFFFF)
-      && TEST_LITERAL(-0xFFFFFFFFFFFFFFFF) 
+      && TEST_LITERAL_SIGNED(-0xF)
+      && TEST_LITERAL_SIGNED(-0xFF)
+      && TEST_LITERAL_SIGNED(-0xFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFFFFFF)
+      && TEST_LITERAL_SIGNED(-0xFFFFFFFFFFFFFFFF) 
 
 
-      && TEST_LITERAL(-01)
-      && TEST_LITERAL(-017)
-      && TEST_LITERAL(-0177)
-      && TEST_LITERAL(-01777)
-      && TEST_LITERAL(-017777)
-      && TEST_LITERAL(-0177777)
-      && TEST_LITERAL(-01777777)
-      && TEST_LITERAL(-017777777)
-      && TEST_LITERAL(-0177777777)
-      && TEST_LITERAL(-01777777777)
-      && TEST_LITERAL(-017777777777)
-      && TEST_LITERAL(-0177777777777)
-      && TEST_LITERAL(-01777777777777)
-      && TEST_LITERAL(-017777777777777)
-      && TEST_LITERAL(-0177777777777777)
-      && TEST_LITERAL(-01777777777777777)
-      && TEST_LITERAL(-017777777777777777)
-      && TEST_LITERAL(-0177777777777777777)
-      && TEST_LITERAL(-01777777777777777777)
-      && TEST_LITERAL(-017777777777777777777)
-      && TEST_LITERAL(-0177777777777777777777)
-      && TEST_LITERAL(-01777777777777777777777)
+      && TEST_LITERAL_SIGNED(-01)
+      && TEST_LITERAL_SIGNED(-017)
+      && TEST_LITERAL_SIGNED(-0177)
+      && TEST_LITERAL_SIGNED(-01777)
+      && TEST_LITERAL_SIGNED(-017777)
+      && TEST_LITERAL_SIGNED(-0177777)
+      && TEST_LITERAL_SIGNED(-01777777)
+      && TEST_LITERAL_SIGNED(-017777777)
+      && TEST_LITERAL_SIGNED(-0177777777)
+      && TEST_LITERAL_SIGNED(-01777777777)
+      && TEST_LITERAL_SIGNED(-017777777777)
+      && TEST_LITERAL_SIGNED(-0177777777777)
+      && TEST_LITERAL_SIGNED(-01777777777777)
+      && TEST_LITERAL_SIGNED(-017777777777777)
+      && TEST_LITERAL_SIGNED(-0177777777777777)
+      && TEST_LITERAL_SIGNED(-01777777777777777)
+      && TEST_LITERAL_SIGNED(-017777777777777777)
+      && TEST_LITERAL_SIGNED(-0177777777777777777)
+      && TEST_LITERAL_SIGNED(-01777777777777777777)
+      && TEST_LITERAL_SIGNED(-017777777777777777777)
+      && TEST_LITERAL_SIGNED(-0177777777777777777777)
+      && TEST_LITERAL_SIGNED(-01777777777777777777777)
 
-      && TEST_LITERAL(-1)
-      && TEST_LITERAL(-17)
-      && TEST_LITERAL(-177)
-      && TEST_LITERAL(-1777)
-      && TEST_LITERAL(-17777)
-      && TEST_LITERAL(-177777)
-      && TEST_LITERAL(-1777777)
-      && TEST_LITERAL(-17777777)
-      && TEST_LITERAL(-177777777)
-      && TEST_LITERAL(-1777777777)
-      && TEST_LITERAL(-17777777777)
-      && TEST_LITERAL(-177777777777)
-      && TEST_LITERAL(-1777777777777)
-      && TEST_LITERAL(-17777777777777)
-      && TEST_LITERAL(-177777777777777)
-      && TEST_LITERAL(-1777777777777777)
-      && TEST_LITERAL(-17777777777777777)
-      && TEST_LITERAL(-177777777777777777)
-      && TEST_LITERAL(-1777777777777777777)
+      && TEST_LITERAL_SIGNED(-1)
+      && TEST_LITERAL_SIGNED(-17)
+      && TEST_LITERAL_SIGNED(-177)
+      && TEST_LITERAL_SIGNED(-1777)
+      && TEST_LITERAL_SIGNED(-17777)
+      && TEST_LITERAL_SIGNED(-177777)
+      && TEST_LITERAL_SIGNED(-1777777)
+      && TEST_LITERAL_SIGNED(-17777777)
+      && TEST_LITERAL_SIGNED(-177777777)
+      && TEST_LITERAL_SIGNED(-1777777777)
+      && TEST_LITERAL_SIGNED(-17777777777)
+      && TEST_LITERAL_SIGNED(-177777777777)
+      && TEST_LITERAL_SIGNED(-1777777777777)
+      && TEST_LITERAL_SIGNED(-17777777777777)
+      && TEST_LITERAL_SIGNED(-177777777777777)
+      && TEST_LITERAL_SIGNED(-1777777777777777)
+      && TEST_LITERAL_SIGNED(-17777777777777777)
+      && TEST_LITERAL_SIGNED(-177777777777777777)
+      && TEST_LITERAL_SIGNED(-1777777777777777777)
 
       // Test 8/16/24/32 bit boundaries for various types
 
@@ -194,10 +194,10 @@ int main()
       && TEST_LITERAL(16777215)
       && TEST_LITERAL(4294967295)
 
-      && TEST_LITERAL(-255)
-      && TEST_LITERAL(-65535)
-      && TEST_LITERAL(-16777215)
-      && TEST_LITERAL(-4294967295)
+      && TEST_LITERAL_SIGNED(-255)
+      && TEST_LITERAL_SIGNED(-65535)
+      && TEST_LITERAL_SIGNED(-16777215)
+      && TEST_LITERAL_SIGNED(-4294967295)
 
       && TEST_LITERAL(255u)
       && TEST_LITERAL(65535u)