D6's pre-truncation capped every space's bucket at PER_SPACE=5 before
the round-robin, so a single-space deployment (the common single-
hackerspace case) drained only 5 emails/min instead of 20 — a 4x
slowdown introduced by the fairness fix. Fairness must bind only under
contention: per-space queues are now bounded solely by the CANDIDATES
fetch and the round-robin itself caps any one space's share when
multiple compete; a lone space drains the full BATCH again. Caught
verifying the D1-D10 batch.
Moheeb Zara
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