The packages are stuck on py3.6 which means they will be pain once we switch to 3.7. Please test them on 3.7 *and* 3.8 (so we don't to revisit this in a few months), and update PYTHON_COMPAT appropriately. If it doesn't work, please either fix it, remove Python or issue last rites. Please consider this urgent.
This package has broken tests and seems entirely dead upstream.
Note that it seems that the same test fails with python-3.6 as well.
Fixed in cbor-1.0.0-r1