diff --git a/server/entertainment_decider/common.py b/server/entertainment_decider/common.py
index 1c6323d..cfeaf5d 100644
--- a/server/entertainment_decider/common.py
+++ b/server/entertainment_decider/common.py
@@ -1,11 +1,9 @@
 from datetime import date, datetime
 import sys
 from typing import (
-    Literal,
     Optional,
     Sequence,
     TypeVar,
-    Union,
 )
 
 
@@ -37,17 +35,3 @@ def trim(docstring: str) -> str:
         trimmed.pop(0)
     # Return a single string:
     return "\n".join(trimmed)
-
-
-def update_bool_value(
-    old_value: bool, new_value: Union[bool, Literal["toggle"]]
-) -> bool:
-    if new_value == "toggle":
-        return not old_value
-    if type(new_value) != bool:
-        raise Exception(
-            f'Invalid type of new_value: Expected bool or literal "toggle", got type={type(new_value)!r}, value={new_value!r}'
-        )
-    return new_value
-
-
diff --git a/server/entertainment_decider/common/__init__.py b/server/entertainment_decider/common/__init__.py
index 85d3cda..43be718 100644
--- a/server/entertainment_decider/common/__init__.py
+++ b/server/entertainment_decider/common/__init__.py
@@ -4,6 +4,9 @@ from ._itertools import (
     iter_lookahead,
     limit_iter,
 )
+from ._setting_handler import (
+    update_bool_value,
+)
 from ._subprocess import (
     call,
 )
@@ -15,4 +18,5 @@ __all__ = [
     "fix_iter",
     "iter_lookahead",
     "limit_iter",
+    "update_bool_value",
 ]
diff --git a/server/entertainment_decider/common/_setting_handler.py b/server/entertainment_decider/common/_setting_handler.py
new file mode 100644
index 0000000..028a8c3
--- /dev/null
+++ b/server/entertainment_decider/common/_setting_handler.py
@@ -0,0 +1,16 @@
+from typing import (
+    Literal,
+)
+
+
+def update_bool_value(
+    old_value: bool,
+    new_value: bool | Literal["toggle"],
+) -> bool:
+    if new_value == "toggle":
+        return not old_value
+    if type(new_value) != bool:
+        raise Exception(
+            f'Invalid type of new_value: Expected bool or literal "toggle", got type={type(new_value)!r}, value={new_value!r}'
+        )
+    return new_value