3274ee6d8e
Two tests. Counts modulo 3 are spread across all three residues (639/2063/1786), so the u16 array is not a triangle list. And a B record is reached through a specific cell, so a point it references should lie in that cell -- referenced points score 0.79% against a 0.48% random-point control. Chance. The contrast is the point. One section earlier the same u16 entries scored 18379/18379 (100%) on 'are these valid point indices'. I flagged that at the time as the weak bound-check and recorded it as consistent rather than as a finding. The caution was right: the powered version of the same question now returns chance, and had the 100% been written up as the decode this page would carry a confident false statement about MCOL's geometry. Fifth appearance of the pattern across REGN and MCOL and the first time both halves have been run on the same field, so the page now states it plainly: a bound-check asks whether something could be an index, and the answer is set by the size of the target collection rather than by the field's meaning. Datum for the next attempt: the maximum u16 is consistently about 0.75x the point count (923/1232, 1019/1360, 1163/1552, 59/80), too consistent to be coincidence and not explained.