Understanding ansible branching model

Can anyone point me to a doc or site that details what branching model the ansible project is following?
I’d like to better understand what I’m seeing in the github repository, and apply some of that to our internal workflow if appropriate and useful.

No doc or site, the model also has changed as of 1.9., so this is what we currently do:

Mainly we develop against the /devel branch, once we are ready to release we create the stable-x.x branch and release from there (release candidates and finals get tagged here), also subsequent bug fixes will be cherry-picked into it for x.x.x releases.

Thanks Brian