As a level 6 player, it is impossible to upgrade a portal to level 5 on your own:
2*6 + 2*5 + 4*4 + 2*3 = 4.75
So the portal will be Level 4 at max. It also shows "L4" in the app when you select the portal.
When hacking, it will yield mostly items of level max(portal lvl, player lvl), uncommonly of that +/-1 and very rarely +/-2
My question is: Does hacking a level 4.75 portal have the same item drop probability as a plain level 4 portal? Or will I get level 5 items more often?
There was a similar question a few months ago, but the answers didn't rely on hard evidence or credible sources:
Edit to make the difference more obvious:
I do NOT want to know what other factors might influence the items dropped. This question is specifically about whether the portal level is counted discrete (1, 2, 3, 4, 5, ...) or if intermediate levels (4.125, 4.25, 4.5, ...) exist for calculation.