index_of
if ((n = index_of(field->params[i].key)) >= 0)
if ((n = index_of(field->params[i].key)) < 0)
n = index_of(field->params[i].key);
if (index_of(field->params[i].key) < 0)
if ((j = index_of(field->params[i].key)) < 0)