From 22692cae3f3576aa4d50d6b2e1f0c07f7a0fd1b3 Mon Sep 17 00:00:00 2001
From: teutoburg <ghost@instruct.at>
Date: Mon, 13 Nov 2023 19:37:06 +0100
Subject: [PATCH] Add warning for top-level bang-keys

---
 astar_utils/nested_mapping.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/astar_utils/nested_mapping.py b/astar_utils/nested_mapping.py
index 2370547..9c9c5af 100644
--- a/astar_utils/nested_mapping.py
+++ b/astar_utils/nested_mapping.py
@@ -41,6 +41,9 @@ def update(self, new_dict: MutableMapping) -> None:
             to_pop = []
             for key in new_dict:
                 if key.startswith("!"):
+                    logging.warning(
+                        "Using bang-strings in KEYS is deprecated and will no "
+                        "longer work in future releases: %s", key)
                     self[key] = new_dict[key]
                     to_pop.append(key)
             for key in to_pop: