Oh! Sorry! It was in the continuation of the previous post but I must say that I didn't understand well kazk's post:-(

Diameter a general notion in metric spaces. Although I concede that making cylinders an exception with a different definition giving smaller values may be popular in some presentations of spatial geometry in English. I wouldn't support it, however. It's easy to say "diameter of the base" for the other notion, but if you call that diameter, then it poses more difficulty to accurately capture the diameter in the metric sense.

ByteEater: I'm curious about where did you get that definition about the diameter of a cylinder. A cylinder is well defined given a radius or a diameter (they're implicitly referred to the base or a cut parallel to it) and a height.

@g964: that was the answer to another question. ;)

Thanks for your post. I copy below kazk's answer to my post (kazk is the CW admin):

Some misconfiguration caused the job to clean up guest users not to run periodically, and that wasn't noticed until recently. I fixed the bug, but it might be still catching up. It wasn't cleaning up the guests for about a year if I remember correctly.
The job removes guest accounts older than 2 days, and runs daily.
I'll take a look.

Cheers!