SQLAlchemy Unicode warning

[simpsus]

/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/default.py:463: SAWarning: Unicode type received non-unicode bind param value.
  param.append(processors[key](compiled_params[key]))

In the intarwebs I find this discussion to it:

http://stackoverflow.com/questions/966352/unicode-problem-with-sqlalchemy

But I did not run into the problem the OP did, so it is questionable if the fixes work towards our solution.
Another somewaht related resource is:

https://groups.google.com/forum/?fromgroups=#!msg/sqlalchemy/5dnrLBbd7nQ/BijDrVn5nIgJ

[wolfer (wolfer7)]

when is this warning shown?