need for kpairs() ?

[Asko Kauppi <askok@...>]

I've been doing quite a lot of "iterate all non-numeric indices"  
lately (going through XML attributes) and was wondering, have others  
noticed a need for a "third" iterator, like ipairs() and pairs() are  
now.

What it would be is like pairs() but skipping any numeric indeces  
(even negative, and non-integer, so it wouldn't be strictly a  
negation of ipairs).

Doing this iterator is trivial, and I will do one. But about the  
survey: would YOU need one, as well?

-ak