def standardize_cell_val v
      v = ((float = Float(v)) && (float % 1.0 == 0) ? float.to_i : float) rescue v
      v = v.force_encoding("UTF-8") if v.is_a?(String)
      v
    end
def standardize_cell_val v
      v = ((float = Float(v)) && (float % 1.0 == 0) ? float.to_i : float) rescue v
      v = v.force_encoding("UTF-8") if v.is_a?(String)
      v
    end
Convert number string to number