Today a merge deleted a bunch of code I had pushed in different branch. How the fuck did that happen? No conflict nothing! How can git delete something like this?!

Uh, really depends on what you did on your master. But git didnt delete anything, most probably. Use Git reflog to go to commit before merge and get you stuff back :)

@bolovsky I only merge on master and work on different branches which are up to date with master. I've no idea how did this happen. Had to rewrite everything.

@jshint don't know exactly the problem, but git doesn't delete stuff. If you committed it at some point, it should be there, unless you did some --force action. If that was the case, it's gone. If not, git reflog (which is apparently really underrated) :)