The raw data to set, or the array to write the current option value into.
This list must be the correct length for the expected option. For most options that take int or bool values, the length should be 4. For options that expect a struct (such as an in_addr_t), the length should be the correct length for that struct.
final Uint8List value
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https://api.dart.dev/stable/2.5.0/dart-io/RawSocketOption/value.html