Ruby

Hello,

Issue:¶

Two different machines with the same ruby version return different results for the method "sort". One machine runs macOS and the other runs Linux. More specifically, when I run "ruby --version" in the macOS machine, I get "ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]" and when I run "ruby --version" in the Linux machine, I get "ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-linux]".

Reproducibility:¶

If you run the following script in the two machines described above, you get different results.

arr  = [{"id"=>"549741245", "changed"=>"2015-06-24T22:02:51Z"},
 {"id"=>"549760170", "changed"=>"2015-06-24T23:15:44Z"}, 
 {"id"=>"549760171", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549760172", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"551080187", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080188", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080189", "changed"=>"2015-06-29T21:49:24Z"}]
arr.sort { |a, b| b['changed'] <=> a['changed'] }

Results
The macOS machine returns

[{"id"=>"551080189", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080187", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080188", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"549760172", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549760170", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549760171", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549741245", "changed"=>"2015-06-24T22:02:51Z"}]

The Linux machine returns

[{"id"=>"551080187", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080188", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"551080189", "changed"=>"2015-06-29T21:49:24Z"},
 {"id"=>"549760170", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549760171", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549760172", "changed"=>"2015-06-24T23:15:44Z"},
 {"id"=>"549741245", "changed"=>"2015-06-24T22:02:51Z"}]

I would expect for sort (ruby 2.3.3p222) to return the same results given the same input.

Thanks!