[21:56:40] <Krinkle>	 TimStarling: I'm guessing this shows us the long tail of either 1) open browser tabs where after several days someone is doing something interactive that loads new code where that code was not yet in their local cache and where the old version has since fallen out of Varnish thus the server falls back to serving the current version calling the undefined impl, or 2) browsers that ignore or otherwise violate cache-control must-revalidate 
[21:56:40] <Krinkle>	 and perform at least one more page view with a stale resource.
[21:57:23] <Krinkle>	 https://usercontent.irccloud-cdn.com/file/HcpegzUo/Screenshot%202023-08-30%20at%2022.54.31.png