Constant MAX_LOOP_ITER 

pub(super) const MAX_LOOP_ITER: i64 = _; // 2_097_152i64

Clamp on loop(N, body) iteration count. MD2 presets in the corpus run up to 1024 * 1024 (gmegabuf full-clear); allow that plus a small safety margin so a single rogue preset can’t lock the frame thread for arbitrarily long.