During March 2025, Rahim focused on enhancing error handling in the ruby/ruby and ruby/json repositories by addressing compatibility issues in JSON error reporting across Ruby versions. He implemented a version-aware guard in the JSON::GeneratorError#detailed_message method to prevent undefined method errors in Ruby versions prior to 3.2, ensuring consistent and reliable error messages. Rahim’s approach included adding comprehensive regression tests and aligning behavior between the core Ruby library and the json gem. Leveraging his expertise in Ruby, error handling, and test-driven development, he improved stability and reduced debugging time for downstream users relying on JSON generation.