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When unpacking a row that contains a single item, always try `rec[0]` first, and only fall back to `tuple(rec.values())[0]` after checking that `rec.values` is callable.
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The starting point of this branch was that the
.one()and.all()methods currently choke on queries likeSELECT values FROM something, because they assume that avaluesattribute is a callable similar to thedict.values()method. This is fixed by changing the condition fromhasattr(out, 'values')tocallable(getattr(out, 'values', None)), but while I was at it I also reorganized the code and added a few more tests.