The asynchronous iterator for iterating an asynchronous stream.
This type is not
Sendable. Don’t use it from multiple concurrent contexts. It is a programmer error to invoke
next() from a concurrent context that contends with another such call, which results in a call to
Citizens in _Concurrency
A type that asynchronously supplies the values of a sequence one at a time.
) async throws -> Element?
The next value from the asynchronous stream.