More perlish would be:
insert_head => unshift insert_tail => push
Although these method-names are perfect.
next($b) => next() prev($b) => prev()
I don't know whether my conception is right but $bb is something like an iterator. Why does one have to pass $bb->next($b) $b, wouldn't $bb->next() that's how iterator work, at least i'd expect that.
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