in reply to getting rid of costly special features
I do for the first two, but never into overflow: I use it when I know the length will stay the same, but I use it for numeric as well as for alphanumeric.
Thinking of it, I seldom - maybe never - use those in one-liners, but I do in scripts:
$ perl -wE'$_="image001";say++$_' image002
Go perl! :)
Enjoy, Have FUN! H.Merijn
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