Why do the URLs of posts here change?

Steven D'Aprano steve+comp.lang.python at pearwood.info
Fri Jan 9 11:56:44 CET 2015

I have come across this in the past, but today it annoyed me enough that I'm
asking for an explanation.

Posts on this newsgroup/mailing list are archived on the web, but the URLs
seem to change, which leaves dead links if you search for things.

For example, today I searched for a quote about floating point equality by
William Kahan, and I came across this post by me:


But that's a dead link! Here's Google's cache of it:


And here is the actual URL, as it appears today:


Why has the URL changed? Surely this is a bug? Where can I report it?


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