Pytype simply can't distinguish the type for this one entry's value from the
other values:
File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 142, in _hostsettings: No attribute 'append' on None [attribute-error] In Optional[Union[Any, List[nothing], bool, bytes]] File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 142, in _hostsettings: No attribute 'append' on bool [attribute-error] In Optional[Union[Any, List[nothing], bool, bytes]] File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 142, in _hostsettings: No attribute 'append' on bytes [attribute-error] In Optional[Union[Any, List[nothing], bool, bytes]] File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 147, in _hostsettings: No attribute 'append' on None [attribute-error] In Optional[Union[Any, List[Tuple[Any, Any]], bool, bytes]] File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 147, in _hostsettings: No attribute 'append' on bool [attribute-error] In Optional[Union[Any, List[Tuple[Any, Any]], bool, bytes]] File "/mnt/c/Users/Matt/hg/mercurial/sslutil.py", line 147, in _hostsettings: No attribute 'append' on bytes [attribute-error] In Optional[Union[Any, List[Tuple[Any, Any]], bool, bytes]]