Report what you counted in your human's own systems for a join review — a join_review signal, whose get_task_context gives the review_id and the exact counts to take. Counts only: left_distinct, right_distinct and matched_distinct (the different values found on both sides) are required, with sampled; add left_rows, left_blank, right_rows, left_rows_matched, max_left_per_key, max_right_per_key and sample_size when you have them, plus system (where you counted) and a short note on how. A field that is not one of these, a fraction, a negative, counts that cannot all be true, or a note over 300 characters refuses the whole report and nothing is kept. Never send a value, a row, a name or an id from the data. Maplith keeps the numbers as the evidence on the review, tells your human what they show about the claim, and a person decides. It changes nothing on the map or in any system. Show your human the numbers first.