if (isOptional) return defaultValue as T
      throw ProtocolException("expected $this but was $peekedHeader at $reader")
    }

    val result =
      reader.read(name) {
        codec.decode(reader)
      }

    if (typeHint) {
      reader.typeHint = result
    }

    return result
  }

  override fun toDer(
    writer: DerWriter,
    value: T,