Even more problematic, I tried searching for zmq_init, to see if it would be useful for finding how other people had used a specific API function, and it seems

Even more problematic, I tried searching for zmq_init, to see if it would be useful for finding how other people had used a specific API function, and it seems like it treats an underscore just like a space. Not one result on the first page contains "zmq_init" in the summary, it just matched "zmq" by itself for all of them. I'm sure some of them do contain zmq_init in the complete sources, but that's not what it's matching, and for a less common API function, it seems likely a regular google search would be more productive than this. Hopefully they can fix that, just having a bunch of source code indexed, or even available to be indexed if it turns out the current indexing is no good, is a good first step. But it seems like it needs work right now.