actually never implemented a simple list intersection?

tools/tools.py

@@ -3,7 +3,7 @@ import inspect
 import os.path
 import sys
 from functools import wraps
-from typing import Any, Union
+from typing import Any, Union, List
 
 
 def get_script_dir(follow_symlinks: bool = True) -> str:
@@ -76,3 +76,11 @@ def cache(func):
         return result
 
     return newfunc
+
+
+def list_intersection(*args) -> list:
+    ret = set(args[0])
+    for l in args[1:]:
+        ret = ret.intersection(l)
+
+    return list(ret)