I'm not sure what changed before pytype 09-09-2021 (from 04-15-2021), but these
started getting flagged.  PyCharm also flagged these.  This fixes the following:
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 243, in fromlocal: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 309, in lower: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 336, in upperfallback: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
Called from (traceback):
  line 391, in current file
  line 348, in get
  line 318, in upper