O2b asked whether a requirement number can be made worth more than a common
word by weighting each hit with the token's rarity in the bundle, with no
hand-set constant and no declared token class. It can, on one of the three
bundles, and the two it cannot are decomposed rather than guessed.
The rule is log(N/df) over the concepts' own tokens, counted with the same
four-character prefix rule a hit is scored with. It enters the RANKING and
never the GATE: `lexical` stays a count, because `krav` weighs exactly 0 on
all three bundles and a weighted gate would drop every concept matching only
that word -- which is the gate 54a0bc2 falsified for other reasons. One df
table per bundle reaches every stage that scores the question against text,
including the document prior. One pass, 0.241 s over 1 133 concepts.
Measured on four corpora, before and after, with every published figure
reproduced first: gold fused rank 96 -> 103, 9 -> 8 (withheld -> DELIVERED at
rank 8) and 35 -> 35; K2's priced sheet candidate rank 10 -> 2 with the cost
vocabulary and 251 -> 78 without; Q-good unmoved at rank 1; hit@8 5 of 6 with
every rank identical; the S7 control payload byte-identical on the default
command.
DEFAULT OFF, decided by the number and not by taste: it does not win on all
four, because N100's gold loses seven rank positions. Off means the bytes that
were already published, and that is measured -- 8 of 8 payload digests
identical against a frozen copy of 56c1205 built with git archive.
Two limits, both someone else's mechanism and both named: MIN_SHARED_PREFIX=4
makes a unique identifier read as 135-of-446 common on N100, so the weight
correctly ranks a common adjective above the exact requirement number; and RRF
consumes RANKS only, so on N500 -- where the gold already leads the one signal
that can see the identifier, and the other two cannot see it at all -- no
weighting inside a signal can move anything.
Consumption-side only, so no rebuild: the K2 bundle ref 2f82fcfe... stands.
Report: docs/2026-09-08-sjeldenhetsvekt.md. 13 new tests, red first; 8
mutations, 8 red, two of them only after the survivors were read as code -- one
exposed a fixture that put the identifier where the real corpus does not, and
the corrected fixture is what found the RRF limit. Suite 1295 -> 1308.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
