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app/_typing.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from ipaddress import IPv4Address
+from ipaddress import IPv6Address
+from typing import Any
+from typing import TypeVar
+
+T = TypeVar("T")
+
+IPAddress = IPv4Address | IPv6Address
+
+
+class _UnsetSentinel:
+    def __repr__(self) -> str:
+        return "Unset"
+
+    def __copy__(self: T) -> T:
+        return self
+
+    def __reduce__(self) -> str:
+        return "Unset"
+
+    def __deepcopy__(self: T, _: Any) -> T:
+        return self
+
+
+UNSET = _UnsetSentinel()