Re: [whatwg/streams] Interface for push based ReadableStream? (#889)

pull() is called on initialization in order to fill the internal queue up to the default high water mark of 1, so that there is always data available to be read when the consumer asks. If you'd prefer to not have a high water mark of 1, you can set it as such when creating your readable stream, e.g. by passing `new CountQueuingStrategy({ highWaterMark: 0 })` as the second argument.

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