Localization in Ruby on Rails: Yes

Ruby on Rails uses the psych gem to parse YAML locale files, which automatically converts values like Yes/No, On/Off, true/false into boolean types according to YAML 1.1 specification. This behavior can cause unexpected issues when these words are intended as literal translation strings. The psych gem treats Y/y and N/n as literal strings rather than booleans, a decision inherited from the older syck parser to maintain backward compatibility.