During two months contributing to the ruby/ruby repository, Akira Tanaka enhanced core library documentation and implemented new feature behavior. He clarified the Socket::Ifaddr#flags method and Time class internals, making API behavior and time representation more transparent for Ruby developers. In April, Akira extended IO.select to support Float::INFINITY as a timeout, enabling indefinite waits, and updated related tests and documentation to ensure robust, predictable behavior. He also improved documentation for Enumerable and Enumerator, detailing size semantics for infinite and indeterminate cases. His work, primarily in Ruby and C, demonstrated thorough technical writing and careful attention to maintainability and onboarding.