python 3.9 and 3.10 compatibility

bumble/utils.py

@@ -500,6 +500,22 @@ class OpenIntEnum(enum.IntEnum):
         return obj
 
 
+# -----------------------------------------------------------------------------
+class CompatibleIntFlag(enum.IntFlag):
+    """
+    Subclass of `enum.IntFlag` with a `composite_name` property that behaves like the
+    `name` property of the `enum.IntFlag` implementation for python vesions >= 3.11
+    """
+
+    @property
+    def composite_name(self) -> str:
+        return '|'.join(
+            name
+            for flag in self.__class__
+            if self.value & flag.value and (name := flag.name) is not None
+        )
+
+
 # -----------------------------------------------------------------------------
 class ByteSerializable(Protocol):
     """