Adapt this stream to be a Stream<R>
.
This stream is wrapped as a Stream<R>
which checks at run-time that each data event emitted by this stream is also an instance of R
.
Stream<R> cast<R>() => Stream.castFrom<T, R>(this);
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https://api.dartlang.org/stable/2.0.0/dart-async/Stream/cast.html