- Intended to be used in filesystem verified Source.
-read-only
- due to depedency of gitpython on git binaries, gitpythonfs should only be conditionally imported, for example by registering the module using  `register_implementation_in_fsspec()`

- See https://www.rfc-editor.org/rfc/rfc1808.html#section-2.1 . So, for example, gitpythonfs:// is valid and works in fsspec.
- However in bucket-based systems, the bucket name is where the netloc would be - eg s3://bucket_name.  But luckily s3fs (and probably az, gcs etc) already gives helpful error messages if no bucket name given, wrong bucket name given etc.
- As a ToDo, this rule could test only those protocols whose fsspec implementation needs netloc, rather than excluding a few protocols as is done here. But we don't know which protocols this rule was initially added for.

-reduces need to modify code every time a new fsspec implementation is added
- `mtime` is idiomatic in *nix file systems.

- clearer naming in FileItemDict