Writes p.byteLength bytes from p to the underlying data stream. It resolves to the number of bytes written from p (0 <= n <= p.byteLength) or reject with the error encountered that caused the write to stop early. write() must reject with a non-null error if would resolve to n < p.byteLength. write() must not modify the slice data, even temporarily.

This function is one of the lowest level APIs and most users should not work with this directly, but rather use writeAll instead.

Implementations should not retain a reference to p.