Short circuit if the first argument is NOT None, I guess? ;-)
Yes, so a short circuit is sometimes good. Not often imho, for a default
triggered by None, but sometimes...
In the case it is, do you want it to be hidden in an expression? Usually it
would be better to draw attention, when the default is either costly to
compute, or worse, it's evaluation have side effect. I would use an old
fashioned if in those cases...
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