Array.hash error for Bignum

hash_bug.rb

require 'rubygems'

# Array.hash for objects do not produce a Fixnum hash will blow up. This issue
# will be fixed in a future release but I thought you might like to know in
# case you wanted to patch RubyGems for versions prior to the fix.
# 
# (see http://redmine.ruby-lang.org/issues/show/1883)
# 
# I found this error because it prevents an array of Gem::Specifications from
# being converted to YAML, as shown below. Note that in the example rack was
# picked because it's common and fails on my box. If for some reason your rack
# succeeds, I found about half my gems will fail, so surely you will have some
# other one that fails too.

begin
  # fails 
  Gem.source_index.find_name("rack").hash
rescue(RangeError)
  puts "fail with current hash method: (#{$!.message})"
end

begin
  # fails 
  Gem.source_index.find_name("rack").to_yaml
rescue(RangeError)
  puts "fail with current hash method: (#{$!.message})"
end

class Gem::Specification
  def hash
    # one way to produce a Fixnum hash
    super.hash
  end
end

# success
Gem.source_index.find_name("rack").hash
Gem.source_index.find_name("rack").to_yaml
puts "new hash method is ok"