What is the status of PR#3615?  

good question.
   
     I just noticed that a similar condition happens in 1.4_ALPHA when you
   try to mount something under a symlink.  umount resolves the path, but
   mount didn't.
   
     It seems to me that mount should resolve the path, since the resolved
   path is where it is actually mounted.  Would this be acceptable?


it seems that (a) mount should be resolve the path and (b) umount should
be able to unmount relative paths if they *are* mounted, perhaps via some
switch to disable path resolution before calling unmount()... i think.