/usr/lib/s9fes/help/booleanp is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 | R4RS 6.1 (boolean? object) ==> boolean
BOOLEAN? returns #T if OBJECT is either #T or #F and returns #F
otherwise.
(boolean? #f) ==> #t
(boolean? 0) ==> #f
(boolean? '()) ==> #f
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