What is the "fourandsix" user?

[Tom Limoncelli]

What is the purpose of the "fourandsix" account?

I noticed this account on a FreeBSD 12.2-RELEASE machine:

fourandsix:[redacted]:6644:6644::0:0:IPv6 user:/home/fourandsix:/bin/bash

However I can't find which package created it or what its purpose is.
It was created around April 2021, which I believe is when I upgraded
to FreeBSD 12.2.

Thanks in advance,
Tom

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