__future__  unicode_literals

```
from __future__ import unicode_literals
a = 'a'
ba = b'a'
bb = b'b'
```
decompiles to: 
```from __future__ import unicode_literals
a = u'a'
ba = 'a'
bb = 'b'
```

As always look you can consult changes in uncomyle6 around the time this bug was reported for suggestions for how to fix. 