1. 2013-12-29 [ruby-core:59381] [ruby-trunk - Feature #8960] Add Ex ruby-core Charles Nutter 2. 2013-12-13 [ruby-core:59082] [ruby-trunk - Feature #8960] Add Ex ruby-core Nobuyoshi Nakada 3. 2013-09-30 [ruby-core:57489] [ruby-trunk - Feature #8960] Add Ex ruby-core Charles Nutter 4. 2013-09-30 [ruby-core:57470] [ruby-trunk - Feature #8960] Add Ex ruby-core Koichi Sasada