Writethrough VFS File Caching

I'm experimenting with rclone mount, and I'd like to be able to use the VFS file caching mode full. However, it appears that writes are only guaranteed to persist to the server if I use off. My use case has extremely short-lived rclone mounts, so I'd like to be able to guarantee files get uploaded. It seems to me that there ought to be some kind of "writethrough" option or a VFS caching mode for "reads". Does such a feature exist? Or is there some obvious alternative thing I should be looking into?

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