b.Reset()
	b.Write(spaceForLength)
	if err != nil {
		enc.setError(err)
	}
}

// sendActualType sends the requested type, without further investigation, unless
// it's been sent before.
func (enc *Encoder) sendActualType(w io.Writer, state *encoderState, ut *userTypeInfo, actual reflect.Type) (sent bool) {
	if _, alreadySent := enc.sent[actual]; alreadySent {
		return false
	}