uselect: Issues with polling stream wrappers #3394

Currently, uselect module accepts only stream which directly implement MP_STREAM_POLL (baremetal ports) or just exact file and socket streams (unix port). However, these streams can be wrapped in (any number of) other streams, e.g. a socket in websocket in SSL, and such wrapped streams don't work with uselect.

That's apparently what being reported in #3297 .

Solving this on MicroPython level requires a bit of legwork (and associated code), especially given that there're different variants of solution for baremetal vs unix. So, given that uasyncio is the only known component affected, my plan is to try to work it around on its level.

But sooner or later it may affect other users too.