Issue #6763 has been updated by ko1 (Koichi Sasada). I attached my patch. Before (32bit CPU): 3.times{ p ObjectSpace._id2ref(p (0.1+0.2).object_id) } #=> 20932740 0.30000000000000004 20932680 0.30000000000000004 20932630 0.30000000000000004 After (64bit CPU): -100880631653099102 0.30000000000000004 -100880631653099102 0.30000000000000004 -100880631653099102 0.30000000000000004 Performance: http://