- Regarding set-file-mode, set-file-owner and set-file-group: Scsh allows the first argument to be fname, fdes or port. Does srfi-170 restrict it to just a file name?

- I wonder why set-file-owner and set-file-group are separate calls, while the underlying POSIX call is one. It may be for compatibility, but will there be a case that you want to change both owner and group atomically? (I assume it rarely matters, but still, why not expose the POSIX feature?)