Greetings, when I read through the django source code, I see the union and 
union all method is implemented. However, if I remember it right, in 
PostgreSQL, intersection and difference are also have the all method (which 
means the result will contains duplicates).

Here is the documentation of the PostgreSQL:
   https://www.postgresql.org/docs/9.6/static/queries-union.html

So I would like to create a pull request to introduce that feature if you 
like.
How do you think about that?

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