feature or stable

[Dave Yost]

There is a big hole in the documentation about downloading cvs.

http://www.nongnu.org/cvs/#TOCdownloading
says to go here:
http://ftp.gnu.org/non-gnu/cvs/source/
gives these two choices:
  feature/
  nightly-snapshots/
  stable/

I understand nightly-snapshots and stable.  These are standard.  But 
what is feature?  Should I be using feature?  Is it unstable?  These 
questions should be answered on the nongnu.org/cvs page.

Thanks