code: func (c *Client) OpenBinaryStream(prefix, path logdog_types.StreamName, flags ...*streamproto.Flags) (*Stream, error) {
  	return c.open(logpb.StreamType_BINARY, prefix, path, flags...)
  }
docs: // OpenBinaryStream returns a stream for binary data.
  //
  // Each Write will append to the binary data like a normal raw file.