diff --git a/src/Binder/Binder.cpp b/src/Binder/Binder.cpp
index a9f1f0b..6669cbf 100644
--- a/src/Binder/Binder.cpp
+++ b/src/Binder/Binder.cpp
@@ -748,6 +748,9 @@ namespace Porygon::Binder {
             this->_scriptData->Diagnostics->LogInfo(Diagnostics::DiagnosticCode::UnvalidatedCast, exp->GetStartPosition(),
                                                        exp->GetLength());
         }
+        else if (castResult == CastResult::Unchanged){
+            return toCastParameter;
+        }
         return new BoundCastExpression(toCastParameter, destinationType);
     }
 
diff --git a/src/Evaluator/EvalValues/EvalValue.hpp b/src/Evaluator/EvalValues/EvalValue.hpp
index f6bc804..63fab40 100644
--- a/src/Evaluator/EvalValues/EvalValue.hpp
+++ b/src/Evaluator/EvalValues/EvalValue.hpp
@@ -100,7 +100,13 @@ namespace Porygon::Evaluation {
 
         [[nodiscard]]
         virtual EvalValue* Cast(shared_ptr<const ScriptType> castType) const{
-            throw new EvaluationException("Casting to invalid type.");
+            if (castType->GetClass() == this->GetTypeClass()){
+                return this->Clone();
+            }
+            std::stringstream s;
+            s << "Casting to invalid type. From: " << this->ToString();
+            s << ". To: " << castType->ToString();
+            throw EvaluationException(s.str());
         }
 
         virtual std::string ToString() const{
diff --git a/src/ScriptTypes/CastResult.hpp b/src/ScriptTypes/CastResult.hpp
index 0ef85a3..61fa05c 100644
--- a/src/ScriptTypes/CastResult.hpp
+++ b/src/ScriptTypes/CastResult.hpp
@@ -7,6 +7,7 @@ namespace Porygon{
         InvalidCast,
         UncheckedCast,
         DataLoss,
+        Unchanged,
     };
 }
 
diff --git a/src/ScriptTypes/FunctionScriptType.hpp b/src/ScriptTypes/FunctionScriptType.hpp
index e640ef5..8414835 100644
--- a/src/ScriptTypes/FunctionScriptType.hpp
+++ b/src/ScriptTypes/FunctionScriptType.hpp
@@ -55,6 +55,10 @@ namespace Porygon {
                             diagnostics->LogWarning(Diagnostics::DiagnosticCode::DataLossOnCast, parameter->GetStartPosition(),
                                                     parameter->GetLength());
                         }
+                        else if(castResult == CastResult::Unchanged){
+                            parameters->at(i) = parameter;
+                            continue;
+                        }
                         parameters->at(i) = new Binder::BoundCastExpression(parameter, _parameterTypes[i]);
                     }
                 }
diff --git a/src/ScriptTypes/ScriptType.hpp b/src/ScriptTypes/ScriptType.hpp
index 3d20a43..f626ad7 100644
--- a/src/ScriptTypes/ScriptType.hpp
+++ b/src/ScriptTypes/ScriptType.hpp
@@ -115,7 +115,7 @@ namespace Porygon{
 
         [[nodiscard]] CastResult CastableTo(const shared_ptr<const ScriptType>& castType, bool explicitCast) const final{
             if (this->operator==(castType))
-                return CastResult ::ValidCast;
+                return CastResult ::Unchanged;
             if (!explicitCast){
                 if (castType->GetClass() != TypeClass::Number )
                     return CastResult::InvalidCast;