`_ls` overrides base class in incompatible manner

[kylebarron]

Here you default to detail=False in _ls

s3fs/s3fs/core.py

Line 1021 in b4d3fa8

async def _ls(self, path, detail=False, refresh=False, versions=False):

but in the base class of AsyncFileSystem you default to detail=True.

Is it intentional to override the base class in this way? Is every implementor intended to disregard the default value of detail in the base class?