diff --git a/src/python/jw/pkg/lib/App.py b/src/python/jw/pkg/lib/App.py
index 24dcdcb0..1287b527 100644
--- a/src/python/jw/pkg/lib/App.py
+++ b/src/python/jw/pkg/lib/App.py
@@ -137,7 +137,7 @@ class App:  # export
 
         log(DEBUG, '-------------- Running: >' + ' '.join(sys.argv) + '<')
 
-        cmd_classes = LoadTypes(
+        cmd_classes: LoadTypes[AbstractCmd] = LoadTypes(
             modules if modules else ['__main__'],
             type_name_filter = name_filter,
             type_filter = [AbstractCmd],  # type: ignore[type-abstract]
diff --git a/src/python/jw/pkg/lib/Types.py b/src/python/jw/pkg/lib/Types.py
index 93796ba2..f38013c2 100644
--- a/src/python/jw/pkg/lib/Types.py
+++ b/src/python/jw/pkg/lib/Types.py
@@ -11,7 +11,7 @@ from .log import OFF, log, parse_log_level
 
 if TYPE_CHECKING:
     from collections.abc import Iterator
-    from typing import Any
+    from typing import Any, Sequence
 
 T = TypeVar('T')
 
@@ -45,7 +45,7 @@ class LoadTypes(Types[T]):  # export
         self,
         mod_names: list[str],
         type_name_filter: str | None = None,
-        type_filter: list[type[T]] = [],
+        type_filter: Sequence[type[Any]] | None = None,
         debug_level = None,
     ):
         if debug_level is None:
@@ -65,9 +65,12 @@ class LoadTypes(Types[T]):  # export
             log(self.__debug_level, *args, **kwargs)
 
     def _stringify(self):
+        tf = 'None' if self.__type_filter is None else (
+            ', '.join([str(f) for f in self.__type_filter])
+        )
         return [
             'type_name_filter: ' + str(self.__type_name_filter),
-            'type_filter:      ' + ', '.join([str(f) for f in self.__type_filter]),
+            'type_filter:      ' + tf,
             'mod_names:        ' + ', '.join(self.__mod_names),
         ]