Starting from 16w02a, spam clicking now does a lot more damage than normal. Making 1.9 feel like 1.8 again in some way (pvp wise), which I heard about it doing like %50 damage or something like that. I like to know if it's intended or not. If it is, at least nerf the amount of damage spam clicking does.
Anyway, the video below will show comparasions of each sword doing the %50 damage thing as of 16w02a-16w03a and the half a heart damage that 15w51b and under did.

Video proof: https://youtu.be/I1UophrM5bQ