# File lib/vmail/imap_client.rb, line 277
    def number_to_human_size(number)
      if number.to_i < 1024
        "<1kb" # round up to 1kh
      else
        max_exp = UNITS.size - 1
        exponent = (Math.log(number) / Math.log(1024)).to_i # Convert to base 1024
        exponent = max_exp if exponent > max_exp # we need this to avoid overflow for the highest unit
        number  /= 1024 ** exponent
        unit = UNITS[exponent]
        "#{number}#{unit}"
      end
    end