During November 2025, Noib3 contributed to the MeanderingProgrammer/neovim repository by addressing data integrity issues related to buffer substitutions. They focused on resolving stale data problems in the on_bytes callback by designing a new match data tracking structure and updating the extmark_splice function to operate on the latest buffer state after substitutions. This work, implemented primarily in C and Lua, improved the reliability and correctness of substitution operations within Neovim, reducing inconsistencies visible to users. Noib3 applied skills in API development and functional testing to ensure that buffer data remained accurate throughout the substitution process, demonstrating careful attention to code correctness.