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scgmille@xxxxxxxxxxxxxxxxxx wrote: > *-get-left,right returns an undefined value for arbitrary collections. > For sequences and ordered collections it has a very well defined > meaning .... When we suggested something similar for common dictionary functions, you *insisted* that interfaces should only be defined for the collections where the operations are well-defined. Why is it OK to define get-left and get-right for collections where they're not well-defined? Could you please apply your design goals more consistently? -- Bradd W. Szonye http://www.szonye.com/bradd