Android - vector drawables in support library v24.0.0

I use some drawables like abc_ic_ab_back_mtrl_am_alpha that are packed with the support library.

The support library team switched to vector drawables in v23.2.0 for the first time. I followed the instructions (adding aapt flag, etc) and changed the drawable names in all of my code.

But since a lot of people probably didn't like the change, the vector drawables were removed from the next release v23.2.1. So I had to change all of the code again!

Now after updating to v24.0.0, it seems like vector drawables are back again.

Does anyone have a clue about what's going on? Are vector drawables in to stay this time?

Also, the files in ../sdk/extras/android/support/v7/appcompat still don't seem to updated to reflect the change. So where is v24.0.0 being compiled from exactly?