I too added some stuff, but keeping up with the pace of it was annoying. Conflict city, slow reviews made it a headache.
In particular my issues were: - missing range fetches (probably in place now) - Missing version support in various places - bugs wrt to the handling of versioned objects across api calls
My needs are not super mainstream, but I was better off using RustFS in this case. A single lightweight fake would be preferable though.