FIX: Fix isinstance check when using uvloop

Author: nmacholl

CHANGELOG.md

@@ -6,6 +6,10 @@
 - Upgraded `databento-dbn` to 0.61.0:
   - Added `MatchAlgorithm` variant `Allocation`
 
+#### Bug fixes
+- Fixed an issue where the `Live` client would throw a `TypeError` when connecting
+  using `uvloop`
+
 ## 0.79.0 - 2026-06-02
 
 #### Enhancements

databento/live/protocol.py

@@ -190,9 +190,9 @@ def connection_made(self, transport: asyncio.BaseTransport) -> None:
 
         """
         logger.debug("established connection to gateway")
-        if not isinstance(transport, asyncio.Transport):
-            raise TypeError("Connection does not support read-write operations.")
-        self.__transport = transport
+        if not hasattr(transport, "write"):
+            raise TypeError("Connection does not support write operations.")
+        self.__transport = transport  # type: ignore [assignment]
         return super().connection_made(transport)
 
     def connection_lost(self, exc: Exception | None) -> None: