So there's [this route](http://docs.valence.desire2learn.com/res/enroll.html#post--d2l-api-lp-%28version%29-%28orgUnitId%29-sections-%28sectionId%29-enrollments-) to enroll a user in a section, but there doesn't seem to be the opposite: a route to *unenroll* a student from a section. 

In fact, there doesn't seem to be a direct route to unenrolling a user from a section from within the LMS itself. I just watched our administrator "unenroll" a student by switching their role in the section to "no role," which, incidentally, isn't a role available via `/d2l/api/lp/1.4/roles/`. 

What am I missing here?

Thanks!