This should fix seeking from `.Start`, getting the `size`, and `read_at`. Also make the API consistent with the other `*_init` procs in `util.odin` by returning the `io.Reader`.
This should fix seeking from `.Start`, getting the `size`, and `read_at`. Also make the API consistent with the other `*_init` procs in `util.odin` by returning the `io.Reader`.