another nit.

[Han-Wen Nienhuys]

why do assq-ref and friends return #f when the key is not found, in
stead of #<unspecified>? This makes it kind of hard to distinguish
between an alist not containing KEY and  (KEY . #f)

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Han-Wen Nienhuys   |   [EMAIL PROTECTED]    | http://www.cs.uu/~hanwen/