diff --git a/codegen/dbl_list/gen_dbl_list.py b/codegen/dbl_list/gen_dbl_list.py
index be35489..1b98353 100644
--- a/codegen/dbl_list/gen_dbl_list.py
+++ b/codegen/dbl_list/gen_dbl_list.py
@@ -21,15 +21,13 @@ from codegen.datatypes import (
 @dataclass
 class DblListData:
     out_dir: Path
-    common_includes: list[CInclude] = field(default_factory=list)
     hdr_includes: list[CInclude] = field(default_factory=list)
     src_includes: list[CInclude] = field(default_factory=list)
-    common_decl_types: list[CStruct] = field(default_factory=list)
     hdr_decl_types: list[CStruct] = field(default_factory=list)
     src_decl_types: list[CStruct] = field(default_factory=list)
 
 
-def gen_dbl_list():
+def gen_dbl_list(user_datatypes: dict[CDataType, DblListData] = {}):
     def __format_func_body(filename: Path, type_string: str):
         return load_func_body_from_file(filename).format(
             T=type_string,
@@ -37,11 +35,14 @@ def gen_dbl_list():
             Tlower=type_string.lower(),
         )
 
+    common_includes: list[CInclude] = [
+        CInclude(header="../../../common/aliases/aliases.h", local=True),
+    ]
+
+    common_decl_types: list[CStruct] = []
+
     datatypes: dict[CDataType, DblListData] = {
         "Str8": DblListData(
-            common_includes=[
-                CInclude(header="../../../common/aliases/aliases.h", local=True),
-            ],
             src_includes=[
                 CInclude(header="./str8.h", local=True),
             ],
@@ -51,6 +52,8 @@ def gen_dbl_list():
             out_dir=WAPP_SRC_ROOT / "core/strings/str8/",
         ),
     }
+    datatypes.update(user_datatypes)
+
     snippets_dir = Path(__file__).parent / "snippets"
 
     for _type, dbl_list_data in datatypes.items():
@@ -59,7 +62,7 @@ def gen_dbl_list():
         node = CStruct(
             name=f"{type_string}Node",
             cargs=[
-                CArg(name="string", _type=type_string, pointer=CPointer(_type=CPointerType.SINGLE)),
+                CArg(name="item", _type=type_string, pointer=CPointer(_type=CPointerType.SINGLE)),
                 CArg(name="prev", _type=f"{type_string}Node", pointer=CPointer(_type=CPointerType.SINGLE)),
                 CArg(name="next", _type=f"{type_string}Node", pointer=CPointer(_type=CPointerType.SINGLE)),
             ],
@@ -70,7 +73,6 @@ def gen_dbl_list():
             cargs=[
                 CArg(name="first", _type=node, pointer=CPointer(_type=CPointerType.SINGLE)),
                 CArg(name="last", _type=node, pointer=CPointer(_type=CPointerType.SINGLE)),
-                CArg(name="total_size", _type=CType.U64),
                 CArg(name="node_count", _type=CType.U64),
             ],
         )
@@ -169,7 +171,7 @@ def gen_dbl_list():
 
         header = CHeader(
             name=f"{type_string.lower()}_list",
-            decl_types=dbl_list_data.common_decl_types + dbl_list_data.hdr_decl_types,
+            decl_types=common_decl_types + dbl_list_data.hdr_decl_types,
             includes=[],
             types=[node, dl_list],
             funcs=[
@@ -186,15 +188,15 @@ def gen_dbl_list():
 
         source = CSource(
             name=header.name,
-            decl_types=dbl_list_data.common_decl_types + dbl_list_data.src_decl_types,
+            decl_types=common_decl_types + dbl_list_data.src_decl_types,
             includes=[CInclude(header, local=True, same_dir=True), CInclude(header="stddef.h")],
             internal_funcs=[node_to_list_func],
             funcs=header.funcs
         )
 
-        if len(dbl_list_data.common_includes) > 0:
-            header.includes.extend(dbl_list_data.common_includes)
-            source.includes.extend(dbl_list_data.common_includes)
+        if len(common_includes) > 0:
+            header.includes.extend(common_includes)
+            source.includes.extend(common_includes)
 
         if len(dbl_list_data.hdr_includes) > 0:
             header.includes.extend(dbl_list_data.hdr_includes)
diff --git a/codegen/dbl_list/snippets/list_empty b/codegen/dbl_list/snippets/list_empty
index c14804f..93380be 100644
--- a/codegen/dbl_list/snippets/list_empty
+++ b/codegen/dbl_list/snippets/list_empty
@@ -4,5 +4,5 @@
 
   u64 count = list->node_count;
   for (u64 i = 0; i < count; ++i) {{
-    wapp_str8_list_pop_back(list);
+    wapp_{T}_list_pop_back(list);
   }}
diff --git a/codegen/dbl_list/snippets/list_insert b/codegen/dbl_list/snippets/list_insert
index 0b6aa52..88f45b6 100644
--- a/codegen/dbl_list/snippets/list_insert
+++ b/codegen/dbl_list/snippets/list_insert
@@ -1,23 +1,22 @@
-  if (!list || !node || !(node->string)) {{
+  if (!list || !node || !(node->item)) {{
     return;
   }}
 
   if (index == 0) {{
-    wapp_str8_list_push_front(list, node);
+    wapp_{T}_list_push_front(list, node);
     return;
   }} else if (index == list->node_count) {{
-    wapp_str8_list_push_back(list, node);
+    wapp_{T}_list_push_back(list, node);
     return;
   }}
 
-  {T}Node *dst_node = wapp_str8_list_get(list, index);
+  {T}Node *dst_node = wapp_{T}_list_get(list, index);
   if (!dst_node) {{
     return;
   }}
 
   {T}List node_list = {Tlower}_node_to_list(node);
 
-  list->total_size += node_list.total_size;
   list->node_count += node_list.node_count;
 
   {T}Node *prev = dst_node->prev;
diff --git a/codegen/dbl_list/snippets/list_pop_back b/codegen/dbl_list/snippets/list_pop_back
index 3ee8a15..67e370a 100644
--- a/codegen/dbl_list/snippets/list_pop_back
+++ b/codegen/dbl_list/snippets/list_pop_back
@@ -12,7 +12,6 @@
   }}
 
   --(list->node_count);
-  list->total_size -= output->string->size;
   list->last        = output->prev;
 
   output->prev = output->next = NULL;
diff --git a/codegen/dbl_list/snippets/list_pop_front b/codegen/dbl_list/snippets/list_pop_front
index caba8c9..97de159 100644
--- a/codegen/dbl_list/snippets/list_pop_front
+++ b/codegen/dbl_list/snippets/list_pop_front
@@ -12,7 +12,6 @@
   }}
 
   --(list->node_count);
-  list->total_size -= output->string->size;
   list->first       = output->next;
 
   output->prev = output->next = NULL;
diff --git a/codegen/dbl_list/snippets/list_push_back b/codegen/dbl_list/snippets/list_push_back
index cc51dac..4d7b004 100644
--- a/codegen/dbl_list/snippets/list_push_back
+++ b/codegen/dbl_list/snippets/list_push_back
@@ -1,4 +1,4 @@
-  if (!list || !node || !(node->string)) {{
+  if (!list || !node || !(node->item)) {{
     return;
   }}
 
@@ -9,7 +9,6 @@
     return;
   }}
 
-  list->total_size += node_list.total_size;
   list->node_count += node_list.node_count;
 
   {T}Node *last = list->last;
diff --git a/codegen/dbl_list/snippets/list_push_front b/codegen/dbl_list/snippets/list_push_front
index 8989beb..784f669 100644
--- a/codegen/dbl_list/snippets/list_push_front
+++ b/codegen/dbl_list/snippets/list_push_front
@@ -1,4 +1,4 @@
-  if (!list || !node || !(node->string)) {{
+  if (!list || !node || !(node->item)) {{
     return;
   }}
 
@@ -9,7 +9,6 @@
     return;
   }}
 
-  list->total_size += node_list.total_size;
   list->node_count += node_list.node_count;
 
   {T}Node *first = list->first;
diff --git a/codegen/dbl_list/snippets/list_remove b/codegen/dbl_list/snippets/list_remove
index cc213c4..31d0a39 100644
--- a/codegen/dbl_list/snippets/list_remove
+++ b/codegen/dbl_list/snippets/list_remove
@@ -4,14 +4,14 @@
   }}
 
   if (index == 0) {{
-    output = wapp_str8_list_pop_front(list);
+    output = wapp_{T}_list_pop_front(list);
     goto RETURN_{Tupper}_LIST_REMOVE;
   }} else if (index == list->node_count) {{
-    output = wapp_str8_list_pop_back(list);
+    output = wapp_{T}_list_pop_back(list);
     goto RETURN_{Tupper}_LIST_REMOVE;
   }}
 
-  output = wapp_str8_list_get(list, index);
+  output = wapp_{T}_list_get(list, index);
   if (!output) {{
     goto RETURN_{Tupper}_LIST_REMOVE;
   }}
@@ -20,7 +20,6 @@
   output->next->prev = output->prev;
 
   --(list->node_count);
-  list->total_size -= output->string->size;
 
   output->prev = output->next = NULL;
 
diff --git a/codegen/dbl_list/snippets/node_to_list b/codegen/dbl_list/snippets/node_to_list
index 2c52609..6f88b81 100644
--- a/codegen/dbl_list/snippets/node_to_list
+++ b/codegen/dbl_list/snippets/node_to_list
@@ -1,13 +1,11 @@
-  {T}List output = {{.first = node, .last = node, .total_size = node->string->size, .node_count = 1}};
+  {T}List output = {{.first = node, .last = node, .total_size = node->item->size, .node_count = 1}};
 
   while (output.first->prev != NULL) {{
-    output.total_size += output.first->prev->string->size;
     output.first = output.first->prev;
     ++(output.node_count);
   }}
 
   while (output.last->next != NULL) {{
-    output.total_size += output.last->next->string->size;
     output.last = output.last->next;
     ++(output.node_count);
   }}