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Nigel Tao authored
either (0, nil) or an (n, err) such that n > 0 && err != nil. Both cases are valid by the io.Reader contract. R=r CC=golang-dev https://golang.org/cl/12513043
e8489d83
either (0, nil) or an (n, err) such that n > 0 && err != nil. Both cases are valid by the io.Reader contract. R=r CC=golang-dev https://golang.org/cl/12513043