Make Local instances clearable (without deleting)

Author: Andy Babic

asgiref/local.py

@@ -84,7 +84,7 @@ def _get_storage(self):
             self._context_refs.add(context_obj)
         return getattr(context_obj, self._attr_name)
 
-    def __del__(self):
+    def clear(self):
         try:
             for context_obj in self._context_refs:
                 try:
@@ -96,6 +96,9 @@ def __del__(self):
             # to _IterationGuard being None.
             pass
 
+    def __del__(self):
+        self.clear()
+
     def __getattr__(self, key):
         with self._thread_lock:
             storage = self._get_storage()