issue_comments: 961211401

Some thoughts: - fsspec's mapper (or even the filesystem instance) could hold default kwargs to be applied to any open() function, perhaps separate ones for reading and writing. In this case, that would mean supplying acl="public-read". - the consolidate_zarr could be made to accept extra parameters to define how the .zmetadata file is made, perhaps even accept a file-like object to write into, so the user gets complete control - the mapper translates some exceptions into KeyError, which is what zarr needs to conclude that .zmetadata is missing. You could include PermissionError in this now (missing_exceptions kwarg to get_mapper), but we can talk about what the best defaults are.