a readable/writable stream, a function to (re)open the stream, or a filename.
If stream is a stream (instead of a function or a filename), only one method may be called once. Otherwise, methods can be called, but they must be sequenced because this type is non-thread-safe.
DataTape.Reader methods are available only if the stream is readable. DataTape.Writer methods are available only if the stream is writable.
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DataTape is a file or stream that consists of a sequence of Data packets. This type implements DataStore interfaces on top of such a file or stream.