Not to be rude, but if you can't work that out you shouldn't be working on this. I'm sure the author would take a pull request, but but it really sounds like you are nitpicking.
Figures like precision and recall are often expressed either as 66% or 0.66. Confusion really isn't that big a problem.
If you would write mAP: 0.9 or mAP (%): 90 or similar my "professor" would be OK with that.
I guess general rule in science (or maybe engineering) is to define units. I have no doubt that e.g. when you are building rockets (or maybe model airplanes) you would know that e.g. velocity is in m/s. Until somebody thinks in some other way and things blow up.
I just wanted to make some fun comment about missing units and that is it. I have no doubt that anybody browsing that repo would not be confused about mAP being 95.6.
Figures like precision and recall are often expressed either as 66% or 0.66. Confusion really isn't that big a problem.