A while ago I offered to tighten up some of the MAC format tests in NetAddr::MAC. I finally found the time, and the good news is that there was only one check which I needed to add to the module code.
I added a test file for several types of bad MAC which are all now detected.
add bad MAC format tests
add test for Short MAC
thanks oliver, thats much appreciated
just pushed out 0.82 which includes these changes and some additional refinements