I consider the differences between 'use_eq' and 'use_return' to be inconsequential. The hash version can be explained by the hash lookups required. This version also lets you use an arbitrary number of 'last' items, though. I would also use exists over defined.

In reply to RE: A discriminating sort (and some damned lies) by Fastolfe
in thread A discriminating sort (and some damned lies) by arturo

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