diff --git a/cairo/tests/utils/serde.py b/cairo/tests/utils/serde.py
index b0f13173..f12ca4d6 100644
--- a/cairo/tests/utils/serde.py
+++ b/cairo/tests/utils/serde.py
@@ -132,11 +132,12 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
         if "__main__" in full_path:
             full_path = self.main_part + full_path[full_path.index("__main__") + 1 :]
         python_cls = to_python_type(full_path)
+        origin_cls = get_origin(python_cls) or python_cls
 
-        if get_origin(python_cls) is Annotated:
+        if origin_cls is Annotated:
             python_cls, _ = get_args(python_cls)
 
-        if get_origin(python_cls) is Union:
+        if origin_cls is Union:
             value_ptr = self.serialize_pointers(path, ptr)["value"]
             if value_ptr is None:
                 return None
@@ -162,7 +163,7 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
 
             return self._serialize(variant.cairo_type, value_ptr + variant.offset)
 
-        if get_origin(python_cls) is list:
+        if origin_cls in (list, bytearray):
             mapping_struct_ptr = self.serialize_pointers(path, ptr)["value"]
             mapping_struct_path = (
                 get_struct_definition(self.program, path)
@@ -182,7 +183,7 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
             pointers = self.serialize_pointers(mapping_struct_path, mapping_struct_ptr)
             segment_size = pointers["dict_ptr"] - pointers["dict_ptr_start"]
             dict_ptr = pointers["dict_ptr_start"]
-            stack_len = pointers["len"]
+            data_len = pointers["len"]
 
             dict_repr = {
                 self._serialize(key_type, dict_ptr + i): self._serialize(
@@ -190,9 +191,15 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
                 )
                 for i in range(0, segment_size, 3)
             }
-            return [dict_repr[i] for i in range(stack_len)]
+            if origin_cls is bytearray:
+                # For bytearray, convert Bytes1 objects to integers
+                return bytearray(
+                    int.from_bytes(dict_repr[i], "little") for i in range(data_len)
+                )
 
-        if get_origin(python_cls) in (tuple, list, Sequence, abc.Sequence):
+            return [dict_repr[i] for i in range(data_len)]
+
+        if origin_cls in (tuple, Sequence, abc.Sequence):
             # Tuple and list are represented as structs with a pointer to the first element and the length.
             # The value field is a list of Relocatable (pointers to each element) or Felt (tuple of felts).
             # In usual cairo, a pointer to a struct, (e.g. Uint256*) is actually a pointer to one single
@@ -205,7 +212,7 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
                 .cairo_type.pointee.scope.path
             )
             members = get_struct_definition(self.program, tuple_struct_path).members
-            if get_origin(python_cls) is tuple and Ellipsis not in get_args(python_cls):
+            if origin_cls is tuple and Ellipsis not in get_args(python_cls):
                 # These are regular tuples with a given size.
                 return tuple(
                     self._serialize(member.cairo_type, tuple_struct_ptr + member.offset)
@@ -216,9 +223,7 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
                 raw = self.serialize_pointers(tuple_struct_path, tuple_struct_ptr)
                 tuple_item_path = members["data"].cairo_type.pointee.scope.path
                 resolved_cls = (
-                    get_origin(python_cls)
-                    if get_origin(python_cls) not in (Sequence, abc.Sequence)
-                    else list
+                    origin_cls if origin_cls not in (Sequence, abc.Sequence) else list
                 )
                 return resolved_cls(
                     [
@@ -227,10 +232,7 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
                     ]
                 )
 
-        if (
-            get_origin(python_cls) in (Mapping, abc.Mapping, set)
-            or python_cls is bytearray
-        ):
+        if origin_cls in (Mapping, abc.Mapping, set):
             mapping_struct_ptr = self.serialize_pointers(path, ptr)["value"]
             mapping_struct_path = (
                 get_struct_definition(self.program, path)
@@ -251,25 +253,12 @@ def serialize_type(self, path: Tuple[str, ...], ptr) -> Any:
             segment_size = pointers["dict_ptr"] - pointers["dict_ptr_start"]
             dict_ptr = pointers["dict_ptr_start"]
 
-            if get_origin(python_cls) is set:
+            if origin_cls is set:
                 return {
                     self._serialize(key_type, dict_ptr + i)
                     for i in range(0, segment_size, 3)
                 }
 
-            if python_cls is bytearray:
-                # For bytearray, we reconstruct it from the dictionary values up to length
-                d = {
-                    self._serialize(key_type, dict_ptr + i): self._serialize(
-                        value_type, dict_ptr + i + 2
-                    )
-                    for i in range(0, segment_size, 3)
-                }
-                length = pointers["len"]
-                return bytearray(
-                    [int.from_bytes(d[i], "little") for i in range(length)]
-                )
-
             return {
                 self._serialize(key_type, dict_ptr + i): self._serialize(
                     value_type, dict_ptr + i + 2