+(assert (csubtypep (specifier-type '(or (single-float -1.0 1.0)
+ (single-float 0.1)))
+ (specifier-type '(or (real -1 7)
+ (single-float 0.1)
+ (single-float -1.0 1.0)))))
+(assert (not (csubtypep (specifier-type '(or (real -1 7)
+ (single-float 0.1)
+ (single-float -1.0 1.0)))
+ (specifier-type '(or (single-float -1.0 1.0)
+ (single-float 0.1))))))
+
+(assert (sb-xc:typep #\, 'character))
+(assert (sb-xc:typep #\@ 'character))
+
+(assert (type= (type-intersection (specifier-type '(member #\a #\c #\e))
+ (specifier-type '(member #\b #\c #\f)))
+ (specifier-type '(member #\c))))