The class of streams that can access multiple elements with a single read/write command. These streams support the stream extension and buffer access protocols.
Streams of this class support the buffer-size: init-keyword, which can be used to suggest the size of the stream’s buffer. However, the instantiated stream might not use this value: it is taken purely as a suggested value. For example, a stream that uses a specific device’s hardware buffer might use a fixed buffer size regardless of the value passed with the buffer-size: init-keyword.
abstract primary open