* Support uploading and downloading to in-memory R objects, without having to create a temporary file. Uploading can be done with `src` a `rawConnection` or `textConnection` object. For downloading, if `dest` is `NULL`, the downloaded data is returned as a raw vector, or if `dest` is a `rawConnection`, in the connection object. See the examples in the documentation.
* Implement parallel file transfers using a background pool of R processes. This can significantly speed up transfers when working with multiple small files.
