Some new iterator methods?

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HI!

I use Class::DBI in a variety of situation, but in my most recent job I 
wish I had a couple of new iterator methods, particularly:

->previous
->last

would be wonderfully useful. Presently, so as not to break any 
encapsulation rules, I keep the iterator array and an index of where I am 
currently looking in the array. Thus I can use a slice to move to the 
previous record, or to move to the last record.

What do others think?

...john