archival: force a `CompressionError` to bytes before passing to `error.Abort` I'm not sure what changed before pytype 09-09-2021 (from 04-15-2021), but this started getting flagged. This fixes: File "/mnt/c/Users/Matt/hg/mercurial/archival.py", line 199, in taropen: Function bytestr.__init__ was called with the wrong arguments [wrong-arg-types] Expected: (self, ints: Iterable[int]) Actually passed: (self, ints: tarfile.CompressionError) Attributes of protocol Iterable[int] are not implemented on tarfile.CompressionError: __iter__ Differential Revision: https://phab.mercurial-scm.org/D11472