pkgng - Obsolete Dependencies?

[Walter Hurry]

On several of my boxes (set up with pkgng), libcheck was recorded as a 
dependency of a number of (wxPython etc.) packages. However, I noticed 
that on a fresh install, libcheck did not get pulled in.

So I returned to the older boxes and reinstalled the depending packages, 
using 'pkg install -f'. Lo and behold, the dependencies disappeared.

Is this expected behaviour?