help needed from tk/tcl experts

Our cffi-backed tk/tcl implementation is failing the test_idel tests [0] 
on python3.7, and the failures persist in the 3.8 branch.

Could someone who understands the way it is supposed to work take a look?

There is something tricky about passing unicode strings and kwargs that 
we don't have right.

This is pure python + cffi + tk/tcl, no RPython needed, no long 
translation times.


If you wish to help but don't know how to start, let us know, anyone is 
welcome to pitch in.


Thanks

Matti


[0] 
http://buildbot.pypy.org/summary/longrepr?testname=unmodified&builder=pypy-c-jit-linux-x86-64&build=7734&mod=lib-python.3.test.test_idle