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So, perhaps this SRFI would be better suited by developing a thorough pattern language, which `let' could be extended to use. The "values" part of this proposal would simply fall out of such an approach.
Or, on the other hand, perhaps this SRFI should remain within it's current scope, but in that case I would suggest leaving the extension of `let' in such a way that it is still possible to extend `let' to use patterns in the future. For this reason, I suggest keeping the `values' keyword that Neil W. Van Dyke recently argued against.