MLX_BUN_FILL=off|strict|echo (default off). echo is additive: the strict rows still apply (and stay policy "assert"); the echo index joins as a second, weaker source. Lab tier — default off, A/B before any default.
echo
MLX_BUN_FILL=off|strict|echo (default off).
echois additive: the strict rows still apply (and stay policy "assert"); the echo index joins as a second, weaker source. Lab tier — default off, A/B before any default.