def data=(v)
      Axlsx::validate_string(v)
      self.type = TYPES[:stream] unless @type
      @size = v.size
      @data = v.bytes.to_a
    end
def data=(v)
      Axlsx::validate_string(v)
      self.type = TYPES[:stream] unless @type
      @size = v.size
      @data = v.bytes.to_a
    end
Set the data associated with the stream. If the stream type is undefined, we automatically specify the storage as a stream type.    # with the exception of storages that are type root, all storages with data should be type stream.
 @param [String] v The data for this storages stream
 @return [Array]