Those are already in use.
The code was combination made-up for example (started that way), then
got lazy and copied in some actual lines resulting in '$url' (in my example), being blessed one place, while the actual code used '$up' (url pointer). For the example, I thought url was more clear, though in my code, use of 'p' suffixes is done enough to make the use of '$u' in class '_U_rl', sufficient to me to mean 'url_pointer'.
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