gh-101143: Remove references to TimerHandle from asyncio.base_events.BaseEventLoop._add_callback (#101197)

Co-authored-by: Kumar Aditya <[email protected]>

Author: bdraco

Lib/asyncio/base_events.py

@@ -1857,12 +1857,9 @@ def call_exception_handler(self, context):
                                  exc_info=True)
 
     def _add_callback(self, handle):
-        """Add a Handle to _scheduled (TimerHandle) or _ready."""
-        assert isinstance(handle, events.Handle), 'A Handle is required here'
-        if handle._cancelled:
-            return
-        assert not isinstance(handle, events.TimerHandle)
-        self._ready.append(handle)
+        """Add a Handle to _ready."""
+        if not handle._cancelled:
+            self._ready.append(handle)
 
     def _add_callback_signalsafe(self, handle):
         """Like _add_callback() but called from a signal handler."""

Misc/NEWS.d/next/Library/2023-01-20-10-46-59.gh-issue-101143.hJo8hu.rst

@@ -0,0 +1,2 @@
+Remove unused references to :class:`~asyncio.TimerHandle` in
+``asyncio.base_events.BaseEventLoop._add_callback``.