Zeromq will have changed a lot since then, but some time in the 2010s, I prototyped a system using it (which was going to be a major production system in a larg

Zeromq will have changed a lot since then, but some time in the 2010s, I prototyped a system using it (which was going to be a major production system in a large tech company) and had weird unexpected blocking issues with it. To debug, I sat down to read a bunch of the zeromq code, just to realize that it was using assert() to handle wire protocol errors (unrelated to the blocking bug). I've never dropped a piece of software as quickly as that.