Interesting. I just posted the link from this X post [1] without modifying it (and it wasn’t 0.0.0.0…). I think one thing HN does is that when it detects a HTTP redirect, it will start using the referred to URL instead…
<link rel="canonical" href="http://0.0.0.0:4000/draft-blog/2025/10/26/history-of-lambda-syntax.html" />
.. that the blog is called draft-blog doesn't help either.