No Scheme standard requires (eq? #\a #\a) to return #t, but most implementations do. The exceptions:
(eq? #\a #\a)
#t
SISC, IronScheme, KSi, Scheme 9, UMB, Llava: returns #f.
#f
XLisp: returns (), which is the same as #f.
()
Schemik, SIOD: no character type.
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