Thanks for the historical perspective, puzzler!
In addition to performance considerations, *Clojure Programming* points to
an inconsistency between hash codes for longs and BigIntegers as a
motivation.
Using the example number from that excellent book on Clojure 1.5.1 (on Java
8, FWIW), I can cause this:
#{6948736584 (biginteger 6948736584)}
; => #{6948736584 6948736584}
#{6948736584 (bigint 6948736584)}
; => IllegalArgumentException Duplicate key: 6948736584
clojure.lang.PersistentHashSet.createWithCheck (PersistentHashSet.java:56)
(System/getProperty "java.version")
; => "1.8.0_05"
(clojure-version)
; => "1.5.1"
On Clojure 1.6, thankfully both fail, even in the face of the inconsistency
between .hashCode implementations. If that essentially addresses the 2nd
rationale for introducing a special BigInt class, maybe with both things
being fixed with Java 8 and Clojure 1.6 BigInteger could come back as the
sole arbitrary precision representation of ℤ.
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