remove Buffer type to make it compatible with python 3.10 and above

rohmu/util.py

@@ -10,7 +10,6 @@
 from itertools import islice
 from rohmu.typing import HasFileno
 from typing import BinaryIO, Generator, Iterable, Optional, Tuple, TypeVar, Union
-from typing_extensions import Buffer
 
 import fcntl
 import logging
@@ -205,10 +204,10 @@ def seek(self, offset: int, whence: int = 0) -> int:
     def truncate(self, size: Optional[int] = None) -> int:
         raise UnsupportedOperation("truncate")
 
-    def write(self, s: Union[bytes, Buffer]) -> int:
+    def write(self, s: bytes) -> int:  # type: ignore
         raise UnsupportedOperation("write")
 
-    def writelines(self, __lines: Union[Iterable[bytes], Iterable[Buffer]]) -> None:
+    def writelines(self, __lines: Iterable[bytes]) -> None:  # type: ignore
         raise UnsupportedOperation("writelines")
 
     def fileno(self) -> int: