3 cancellation race concerns - better tracking of kernel feedback?
5 isochronous endpoint I/O
9 review functionality missing over 0.1
11 1.0 API style/naming points to reconsider
12 =========================================
13 typedef _cb or _cb_fn or _cb_t?
14 typedef as-is or pointers? libusb_dev_t rather than libusb_dev *?
18 optional timerfd support (runtime detection)
19 notifications of hotplugged/unplugged devices
20 use poll() rather than select()?
21 offer API to create/destroy handle_events thread