elemOp, elemIndir := encOpFor(t.Elem(), inProgress, building)
			helper := encArrayHelper[t.Elem().Kind()]
			op = func(i *encInstr, state *encoderState, array reflect.Value) {
				state.update(i)
				state.enc.encodeArray(state.b, array, *elemOp, elemIndir, array.Len(), helper)
			}
		case reflect.Map:
			keyOp, keyIndir := encOpFor(t.Key(), inProgress, building)