E.g., https://github.com/groovecoder/discord-test/commit/4d938b6066a527f6ef21fe1fec730560bc499c07 changed a single line that had a single compatibility issue. https://github.com/mdn/discord/pull/169#issuecomment-173708235 summarizes: discord seemed to calculate the line as `-1`, which breaks the `POST` to GitHub API to create the comment.