profiling: add an assertion to help pytype...
profiling: add an assertion to help pytype
Pytype 2023.11.21 with Python 3.10.11 (correctly) flagged `self._fp` as possibly
not having a `getvalue()` method, likely since 6a8edf9f0a6d:
File "/mnt/c/Users/Matt/hg/mercurial/profiling.py", line 344, in __exit__:
No attribute 'getvalue' on BinaryIO [attribute-error]
In Union[Any, BinaryIO, io.BytesIO]
It appears this was flagged in CI too, but the test was marked as a success
anyway, so it wasn't noticed. We'll fix that on stable and then merge on top of
this.
