chore: import upstream snapshot with attribution

2026-07-13 13:22:06 +08:00
commit cddb07a176
3370 changed files with 685519 additions and 0 deletions
@@ -0,0 +1,15 @@
+from enum import EnumMeta
+
+
+class MetaEnum(EnumMeta):
+    """Metaclass to support additional features in Enums.
+
+    - `in` operator support: `'value' in MyEnum -> bool`
+    """
+
+    def __contains__(cls, item):
+        try:
+            cls(item)
+        except ValueError:
+            return False
+        return True