/usr/lib/ruby/ is in ruby-i18n-inflector 2.6.6-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/i18n-inflector/
/usr/lib/ruby/vendor_ruby/i18n-inflector.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/api.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/api_strict.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/backend.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/config.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/errors.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/hset.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/inflection_data.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/inflection_data_strict.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/inflector.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/interpolate.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/lazy_enum.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/long_comments.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/options.rb
/usr/lib/ruby/vendor_ruby/i18n-inflector/version.rb