Feature request: Simple-threaded mode.

[vi]

Maybe one can opt-out threading, but gain ability to have !Send + !Sync filesystems?

It can be a Cargo feature or some...

Workaround: set threads to 1 and unsafe impl Send MyFs {} unsafe impl Sync for MyFs.

[moliholy]

I think it's a good suggestion. In my case the file system is implemented using sqlite3, which does not allow multiple threads and gives a compile-time error for not implementing Sync. My workaround was to manually implement Sync in the top-level struct and place a big fat warning saying it shouldn't be accessed concurrently, but a cleaner solution would be preferred.