diff --git a/src/ScriptTypes/ScriptType.cpp b/src/ScriptTypes/ScriptType.cpp
index c4cc8f7..2c005ae 100644
--- a/src/ScriptTypes/ScriptType.cpp
+++ b/src/ScriptTypes/ScriptType.cpp
@@ -36,6 +36,10 @@ namespace Porygon{
             type->RegisterFunctionOption(option);
             return type;
         }
+
+        TypeClass GetTypeClass(ScriptType* t){
+            return t->GetClass();
+        }
     }
 }
 
diff --git a/src/UserData/UserData.cpp b/src/UserData/UserData.cpp
index bbc0acb..6f8e0dc 100644
--- a/src/UserData/UserData.cpp
+++ b/src/UserData/UserData.cpp
@@ -18,5 +18,15 @@ namespace Porygon::UserData {
         auto ud = UserDataStorage::GetUserDataType(typeId);
         return ud->Get()->GetFieldCount();
     }
+
+    void SetIsCastableFunc(uint32_t typeId, bool (*cast)(const ScriptType*, bool)){
+        auto ud = UserDataStorage::GetUserDataType(typeId);
+        ud->Get()->SetIsCastable(cast);
+    }
+
+    void SetCastFunc(uint32_t typeId, Evaluation::EvalValue* (*cast)(void*, const ScriptType*)){
+        auto ud = UserDataStorage::GetUserDataType(typeId);
+        ud->Get()->SetCastFunc(cast);
+    }
     }
 }
\ No newline at end of file
diff --git a/src/UserData/UserData.hpp b/src/UserData/UserData.hpp
index de9a803..5aa1325 100644
--- a/src/UserData/UserData.hpp
+++ b/src/UserData/UserData.hpp
@@ -27,8 +27,11 @@ namespace Porygon::UserData {
         UserDataBinaryOperation* _logicalOr = nullptr;
         UserDataBinaryOperation* _concatenation = nullptr;
 
+        bool (*_isCastable)(const ScriptType* type, bool explicitCast);
+        Evaluation::EvalValue* (*_cast)(void* obj, const ScriptType* castType);
+
     public:
-        explicit UserData(std::unordered_map<uint32_t, UserDataField *> fields)
+        explicit UserData(const std::unordered_map<uint32_t, UserDataField *>& fields)
         {
             for (auto f: fields){
                 _fields.insert({f.first, unique_ptr<UserDataField>(f.second)});
@@ -73,6 +76,23 @@ namespace Porygon::UserData {
             return _fields.size();
         }
 
+        void SetIsCastable(bool (*cast)(const ScriptType* type, bool explicitCast)){
+            _isCastable = cast;
+        }
+
+        bool IsCastable(const shared_ptr<const ScriptType>& castType, bool explicitCast) const{
+            if (_isCastable == nullptr) return false;
+            return _isCastable(castType.get(), explicitCast);
+        }
+
+        void SetCastFunc(Evaluation::EvalValue* (*cast)(void* obj, const ScriptType* castType)){
+            _cast = cast;
+        }
+
+        Evaluation::EvalValue* Cast(void* obj, const ScriptType* castType) const{
+            return _cast(obj, castType);
+        }
+
         [[nodiscard]]
         UserDataBinaryOperation* GetBinaryOperation(Binder::BoundBinaryOperation op){
             switch (op){
diff --git a/src/UserData/UserDataScriptType.cpp b/src/UserData/UserDataScriptType.cpp
index 842cc75..689a3ba 100644
--- a/src/UserData/UserDataScriptType.cpp
+++ b/src/UserData/UserDataScriptType.cpp
@@ -6,5 +6,9 @@ extern "C"{
 UserDataScriptType* CreateUserDataType(uint32_t id){
     return new UserDataScriptType(id);
 }
+
+uint32_t GetScriptTypeUserData(UserDataScriptType* t){
+    return t->GetUserData()->GetKey();
+}
 }
 }
\ No newline at end of file
diff --git a/src/UserData/UserDataScriptType.hpp b/src/UserData/UserDataScriptType.hpp
index 0b8571f..67ea7c7 100644
--- a/src/UserData/UserDataScriptType.hpp
+++ b/src/UserData/UserDataScriptType.hpp
@@ -25,6 +25,10 @@ namespace Porygon::UserData {
             delete _userData;
         }
 
+        RetrievedUserData* GetUserData() const{
+            return _userData;
+        }
+
         bool CanBeIndexedWith(const ScriptType *indexer) const final {
             if (indexer->GetClass() != TypeClass::String) {
                 return false;
@@ -54,6 +58,13 @@ namespace Porygon::UserData {
         [[nodiscard]] inline shared_ptr<const ScriptType> GetIndexedType(uint32_t hash) const final {
             return _userData->Get()->GetField(hash)->GetType();
         }
+
+        [[nodiscard]] CastResult CastableTo(const shared_ptr<const ScriptType>& castType, bool explicitCast) const final{
+            if (_userData->Get()->IsCastable(castType, explicitCast)){
+                return CastResult::ValidCast;
+            }
+            return CastResult ::InvalidCast;
+        }
     };
 }
 
diff --git a/src/UserData/UserDataValue.hpp b/src/UserData/UserDataValue.hpp
index eb909c7..a8e874c 100644
--- a/src/UserData/UserDataValue.hpp
+++ b/src/UserData/UserDataValue.hpp
@@ -73,6 +73,11 @@ namespace Porygon::UserData {
         inline void* GetObjectPointer(){
             return _obj;
         }
+
+        [[nodiscard]]
+        EvalValue* Cast(shared_ptr<const ScriptType> castType) const final{
+            return _userData->Get()->Cast(_obj, castType.get());
+        }
     };
 }