clojure - Clojure 中映射和集合之间的行为不一致

Question

史蒂夫·洛什 posted the following Clojure snippet :

; Integers and Longs are equal.
(= (Integer. 1) (Long. 1))
true

; Even negative ones.
(= (Integer. -1) (Long. -1))
true

; When you use them as keys in maps, the maps are still equal.
(= {(Integer. 1) :foo} {(Long. 1) :foo})
true

(= {(Integer. -1) :foo} {(Long. -1) :foo})
true

; When you use positive numbers as keys to sets, they're also equal.
(= #{(Integer. 1)} #{(Long. 1)})
true

; But negative ones aren't. But only in sets. Maps are fine. lol.
(= #{(Integer. -1)} #{(Long. -1)})
false

这种行为的原因是什么？它是否被认为是一个缺陷，或者是否存在“形式逻辑”/集合论为什么 (Integer.-1) 不等于 (Long.-1) 在持久集中?

Answer 1

这是 Clojure 中的一个错误:http://dev.clojure.org/jira/browse/CLJ-1106

这里是满足堆栈溢出的愚蠢字符限制的文本