Allow explicit casting even when slightly redundant

Author: bodograumann

git/cmd.py

@@ -154,7 +154,7 @@ def pump_stream(
         p_stdout = process.proc.stdout if process.proc else None
         p_stderr = process.proc.stderr if process.proc else None
     else:
-        process = cast(Popen, process)
+        process = cast(Popen, process)  # type: ignore [redundant-cast]
         cmdline = getattr(process, "args", "")
         p_stdout = process.stdout
         p_stderr = process.stderr

git/objects/commit.py

@@ -460,7 +460,7 @@ def _iter_from_process_or_stream(cls, repo: "Repo", proc_or_stream: Union[Popen,
             if proc_or_stream.stdout is not None:
                 stream = proc_or_stream.stdout
         elif hasattr(proc_or_stream, "readline"):
-            proc_or_stream = cast(IO, proc_or_stream)
+            proc_or_stream = cast(IO, proc_or_stream)  # type: ignore [redundant-cast]
             stream = proc_or_stream
 
         readline = stream.readline