The function I provided for hash->keyword-apply is unfortunately
broken; I forgot that there's a requirement on the order of the
keywords we pass to it. Here's a revised version:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (hash->keyword-apply f a-hash [rest-args '()])
(define-values (keys vals)
(for/fold ([keys '()] [vals '()])
([k (sort (hash-keys a-hash) string>? #:key symbol->string)])
(values (cons (string->keyword (symbol->string k)) keys)
(cons (hash-ref a-hash k) vals))))
(keyword-apply f keys vals rest-args))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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