Comparing Ruby 1.8 and Ruby 1.9's hash ordering

ruby1.8-hash.rb

% irb1.8
>> h = Hash.new
=> {}
>> 10.times { |i| h[i] = i*10 }
=> 10
>> h
=> {5=>50, 0=>0, 6=>60, 1=>10, 7=>70, 2=>20, 8=>80, 3=>30, 9=>90, 4=>40}

ruby1.9-hash.rb

% irb1.9
>> h = Hash.new
=> {}
>> 10.times { |i| h[i] = i*10 }
=> 10
>> h
=> {0=>0, 1=>10, 2=>20, 3=>30, 4=>40, 5=>50, 6=>60, 7=>70, 8=>80, 9=>90}