The 'comment becomes a lie' is because you've got magic number there in the comment. If the comment was // We match them by looking for equal-opposite amoun

The 'comment becomes a lie' is because you've got magic number there in the comment. If the comment was // We match them by looking for equal-opposite amounts within an X-day window defined by BANK_TRANSFER_MATCH_WINDOW_DAYS the comment is more evergreen, until the actual logic changes. If/when the logic changes... update the comment?