A playlist has 124 videos. My tool imported 15, then 100, then finally 124.

One of my extension's features imports a whole YouTube playlist into your notebook in one click — paste a playlist link, it pulls every video in as a source. I pointed a 124-video playlist at it to test. It imported 15.

Not 124. Fifteen.

That kicked off two days of chasing round numbers, and every round number turned out to be a lie told by someone else's system.

My importer was reading YouTube's playlist RSS feed — clean, official, no scraping. Turns out that feed hard-caps at ~15 items no matter how big the playlist is. 15 wasn't my data. It was YouTube's feed limit wearing my data's clothes.

So I switched to scraping the playlist page's embedded JSON (ytInitialData) — the same blob the page itself renders from. First run after the switch: 0 videos. The structure had shifted under me. The old playlistVideoRenderer.videoId path was gone; today's YouTube wraps each video in a lockupViewModel with the id sitting in contentId. Fixed the path.