No information.

ISTP-A.

Some notable Upgrade "Glitches" and tidbits regarding MvM:

Heavy's second firing speed doesn't do anything, except on the Tomislav, where the first upgrade instead does nothing. Also, the percentage given is actually wrong. First/second increases it by 14%, the third by 29% and the fourth by 43%. Tomislav is slightly different and maxes at 38%.
Engineer's Sentries don't benefit from the second or third upgrades of firing speed in a normal server. The second tick of sentry firing speed only works with wrangler. However if the server's simulation tick timing is slightly off then the first tick will not work, and the second one will be required. Using hitsounds is the best way to judge if the first tick upgrade worked at all, as its usually impossible to tell otherwise. Canteens also work on the Engi's sentry. Crit canteens max your sentry's firing speed (which you can't achieve normally), Uber canteens make your sentry invulnerable. Recall canteens don't do anything. and refill ammo canteens refill your sentry's ammo and rockets. (Having a strange PDA is hell for mvm, just dont have one if you play MVM.)
Soldier's Rocket Specialist only works on the first tick. The other ticks only slightly increase blast radius on direct hit and projectile speed. Not worth the 200 spent per level.
Spy's 3rd sapper upgrade does NOT make it affect more robots. It only increases the amount of time robots are sapped for.
as mentioned before, since Jungle Inferno, Pyro's flamethrower does more damage to the tank when aiming towards the top. With max damage phlog it does about 25ish per tick and 75 with crits. Along with this, the airblast knockback upgrades can be incredibly increased by flicking up or down when you airblast. Greatly altering how and where the airblast sends enemies.
Unconfirmed but i've heard rumors of sniper's 3rd and 4th charge speed not giving correct amounts of charge speed. Unconfirmed and needs testing.
Medic's canteen specialist only applies after you buy the upgrade and leave the upgrade menu, and go back into it. Canteen specialist also doesn't work with recall canteens.
Burn time and burn dmg on pyro doesn't work (why would you buy that tho anyways.)

alias chargespam "+attack2; wait 1; -attack2; wait 1; chargespam"
chargespam
alias chargespam ""