Why does every title have to be a mystery? Why not tell people what it contains?
I don't think there is a good single-sentence title that would encapsulate the whole thing without being an already well-known fact, like say "Header include order matters".
Also, I wrote this one as a narrative, not revealing the conclusion at the start - basically a reconstructed version of how I encountered it myself. I don't write all my posts like that and it's not for everyone: but once I've decided on that, it makes no sense to reveal the conclusion in the title, I think?
The HN headline could be changed though if it places a priority on information-full titles.
I don't have a similar principled defense of clickbait titles, either in general or mine specifically! I just thought it was a funny one and didn't expend more effort on coming up with a non-clickait one.
That's an independent issue from revealing more info in the title.
I'm just explaining the HN title rules, you can see them here (do a find title):
https://news.ycombinator.com/newsguidelines.html
There's nothing in there about titles having to be 'information-full'. Lots of perfectly HN-good titles aren't.
I didn't submit it to HN so I can't comment on the title choice, other than say it at least reflects the literal title of the page which I guess would be the default when submitting.
I tend to outsource my comments to HN, since my blog is a github pages static site and introducing comments without tracking and ads is a pain, but I definitely don't choose my post titles to satisfy HN rules.