1. 2019-01-31 [ruby-core:91357] [Ruby trunk Bug#15387] Backport r66 ruby-core usa 2. 2019-01-20 [ruby-core:91186] [Ruby trunk Bug#15387] Backport r66 ruby-core nagachika00 3. 2018-12-06 [ruby-core:90340] [Ruby trunk Bug#15387] Backport r66 ruby-core nagachika00