n = expr_allocate_composite (e, f - operations, args, arg_cnt);
n->composite.min_valid = min_valid != -1 ? min_valid : f->array_min_elems;
n = expr_allocate_composite (e, f - operations, args, arg_cnt);
n->composite.min_valid = min_valid != -1 ? min_valid : f->array_min_elems;