ReadableStreamBYOBReader
 Background
BYOB is an abbreviation of bring your own buffer. A ReadableStreamBYOBReader allows reading into a developer-supplied buffer, thus minimizing copies.
An instance of ReadableStreamBYOBReader is functionally identical to ReadableStreamDefaultReader with the exception of the read method.
A ReadableStreamBYOBReader is not instantiated via its constructor. Rather, it is retrieved from a ReadableStream:
 Methods
- read(bufferArrayBufferView):- Promise<ReadableStreamBYOBReadResult>- Returns a promise with the next available chunk of data read into a passed-in buffer.
 
- readAtLeast(minBytes, bufferArrayBufferView):- Promise<ReadableStreamBYOBReadResult>- Returns a promise with the next available chunk of data read into a passed-in buffer. The promise will not resolve until at least minByteshave been read.
 
- Returns a promise with the next available chunk of data read into a passed-in buffer. The promise will not resolve until at least