gregmuellegger/django-autofixture — pull request #44 by AndrewPashkin (2014-07-13 13:54:58+00:00)
Title: Unique constraints checks for uniqueness even if values is NULL

Subj.
That is wrong because in SQL NULL != NULL. So there must be possible to create to records with value NULL in nullable column with unique constraint. Same with unique_together if all fields has NULL values.