Ruby 1.87 Hash equivalence fails on large Fixnums

[ben@…]

On MacOS Leopard 10.5.8 with Ruby 1.87 (all patchlevels <= 174) and all compatible versions of MacPorts (<= 1.8.1)

Hash equivalence fails when a value is a Fixnum > 536870911.

>> {:a => 536870911}.hash == {:a => 536870911}.hash
=> true

>> {:a => 536870912}.hash == {:a => 536870912}.hash
=> false

[visnupx@…]

btw, 229 == 536870912. also, works on snow leopard:

>> {:a => 2**29-1}.hash
=> 2146753031
>> {:a => 2**29-1}.hash
=> 2146753031
>> {:a => 2**29}.hash
=> -2146753029
>> {:a => 2**29}.hash
=> -2146753029

[visnupx@…]

apple's /usr/bin/ruby in snow leopard 10.6.1