behaviour of install -D

[Matthias Klose]

With fileutils-4.0's install 

   install -D foo.c /tmp/bar/

you get the error 

install: /tmp/bar/: cannot overwrite directory with non-directory

however install -D foo.c /tmp/bar/foo.c works. The man page describes
the -D options as "useful" for the 1st format. Is this expected to
work for the 2nd format as well? Is there a rationale for the current
behaviour?

Thanks for a clarification.

       Matthias