@crlf0710 Thank you for the excellent suggestions. Offhand I agree about all of them and think you can go ahead and add them to the op, maybe with the exception of gc - I don't know much about this crate and the Rust GC story is really immature yet.
Most of the issues filed so far are tagged 'easy' or 'help wanted', and posted to the twir thread. I don't have contributor access to the memmap crate, so none of those are tagged, but there are relatively few filed against it.