At least is a beginning. On Linux all tests and the
modified test_descr.py pass.
A few cases in test_descr.py are commented out,
maybe they should be adjusted, reconstructed.
For order disagreement situations: backup logic
picking an element from the first non-empty list and
removing it from all lists, where it appears, and just
throwing a warning instead of an exception could be
put where I set the exception now.
Although in the long run people should learn to use
consistent hiearchies anyway.
PS: I was wondering how to get/reuse lst.remove(o)
functionality from C, apart through
PyObject_CallMethod...
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