Title: #394: Add fix for ipa plugins command
I would like to have `py3 str` <=> `py2 unicode`, `py3 bytes` <=> `py2 str`,
but framework is far away from this ideal state.
So I have no strong opinion, and once we will drop py2, so I'm not sure if we
want to migrate everything in py2 to unicode if it work in other cases.
See the full comment at
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