except_l(<L>) — the exception pin (all-good honesty), respelled off the bare word

X except_l(L) = X holds for all cases except those named in L; naming the exceptions is part of making the claim, not a footnote to it. Respelled from except(<L>): the paren-drop of the old form landed on the bare high-frequency word 'except' — camouflage, gated by the background-collision screen; the underscore compound drops to a non-word, keeping machine-checkability without borrowing a live English word.