Finally I got to a corporation who looked at my track record & audio master's degree, said "damn you must be smart!" & hired me on the spot. I had finally gotten an offer for an RoR position as well at almost the same time but I can't tell you how many interviewers flat-out turned me down for not knowing some random piece of pseudo-hobbyist tech.
Anyone applying for a job in one of those ecosystems should spend ~3 hrs a day Googling these things & coming up with some talking points. I wish I could recommend just saying "I don't know" but I can tell you most interviewers don't get it. Better to just say a couple cursory things you read on the library's wiki page, then "I haven't used it in production though..."