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Bradd W. Szonye wrote: > The SRFI conflates "order" and "bidirectionality" .... Regarding my recommendations for new collection attributes (bidirectional-collection? and random-access-collection?): While I feel that these are important additions, you could leave them to a later SRFI. I could possibly even be persuaded to work on a "generic programming" SRFI that extends collections in this way. I think it's better to include it from the start, but "adopt and extend later" could work too. (I do think it's a good idea to fix the other three issues I brought up, though. Especially the bit about collection-fold-left -- why such a long and ambiguous name for a common operation?) -- Bradd W. Szonye http://www.szonye.com/bradd