Adds byte data to the target consumer, ignoring encoding.
The encoding does not apply to this method, and the data list is passed
directly to the target consumer as a stream event.
This function must not be called when a stream is currently being added
using addStream.
This operation is non-blocking. See flush or done for how to get any
errors generated by this call.
The data list should not be modified after it has been passed to add.
Source
void add(List<int> data) {
_sink.add(data);
}