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R4RS 6.2 (equal? object1 object2) ==> boolean
EQUAL? recursively compares the contents of pairs, vectors, and
strings, applying eqv? on other objects such as numbers and symbols.
A rule of thumb is that objects are generally EQUAL? if they print
the same. EQUAL? may fail to terminate if its arguments are circular
data structures.
(equal? 'a 'a) ==> #t
(equal? '(a) '(a)) ==> #t
(equal? '(a (b) c)
'(a (b) c)) ==> #t
(equal? "abc" "abc") ==> #t
(equal? 2 2) ==> #t
(equal? (make-vector 5 'a)
(make-vector 5 'a)) ==> #t
(equal? (lambda (x) x)
(lambda (y) y)) ==> unspecified
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