Possible documentation/implementation bug for unique_together

I'm relatively new to Django and used unique_together in 1.5 per the development documentation:

unique_together = ("driver", "restaurant")

This appears to cause run time errors leading to a transaction abort.  However, 

unique_together = ("driver", "restaurant",)

seems to work.

Is this a documentation bug or implementation bug?  If so how to determine which and best report it?

Regards,

Richard

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