{
 "version": 1,
 "family": "qwen3_5",
 "source": {
  "bits": 2,
  "group_size": 128,
  "mode": "affine",
  "tied": false
 },
 "eligible": false,
 "reason": "native_head_already_low_bit",
 "basis": "settled 2026-09-03 A/B on Qwen3.8-Flash-Next-JANG_4S fixed-D3: the q4 proposal-head gain was measured against a q8/g64 native head; this bundle's head is already <=6-bit, so a rebuilt proposal copy cannot reduce proposal cost"
}