for 1.0
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cancellation race concerns - better tracking of kernel feedback?
-API docs
isochronous endpoint I/O
thread safety
-abstraction for cross-platform-ness
error codes
fixme review
review functionality missing over 0.1
+endianness of control setup, issues when resubmitting transfers
+rename poll to handle_events
+make libusb_get_pollfds return const?
+doxygen warnings
+make descriptor things const?
1.0 API style/naming points to reconsider
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