mixing interlaced and progressive footage

For years I've accepted the rule that the one thing you can't do in a non-linear editing system is mix progressive and interlaced footage, but I'm thinking that's no longer true - with Resolve 14 at least.
A while back I "accidentally' editied some interlaced footage into a prgressive project. Wow, what had just happened? And recently to remove motion blur I had to de-interlace some shots from a moving car to edit them into an interlaced project. But don't de-interlaced shots effectively become progressive?
So seems from this experience that in Resolve 14 one can mix interlaced and progressive footage in the same project. Can this be true? If so great news. Can't think of any other explanation for the instances I've described above.
Can someone confirm?
Thanks.
John
A while back I "accidentally' editied some interlaced footage into a prgressive project. Wow, what had just happened? And recently to remove motion blur I had to de-interlace some shots from a moving car to edit them into an interlaced project. But don't de-interlaced shots effectively become progressive?
So seems from this experience that in Resolve 14 one can mix interlaced and progressive footage in the same project. Can this be true? If so great news. Can't think of any other explanation for the instances I've described above.
Can someone confirm?
Thanks.
John