def ie_hex_str(color)
      assert_type color, :Color, :color
      alpha = Sass::Util.round(color.alpha * 255).to_s(16).rjust(2, '0')
      identifier("##{alpha}#{color.send(:hex_str)[1..-1]}".upcase)
    end
def ie_hex_str(color)
      assert_type color, :Color, :color
      alpha = Sass::Util.round(color.alpha * 255).to_s(16).rjust(2, '0')
      identifier("##{alpha}#{color.send(:hex_str)[1..-1]}".upcase)
    end
Converts a color into the format understood by IE filters.

 @example
   ie-hex-str(#abc) => #FFAABBCC
   ie-hex-str(#3322BB) => #FF3322BB
   ie-hex-str(rgba(0, 255, 0, 0.5)) => #8000FF00
 @overload ie_hex_str($color)
   @param $color [Sass::Script::Value::Color]
 @return [Sass::Script::Value::String] The IE-formatted string
   representation of the color
 @raise [ArgumentError] if `$color` isn't a color