class Addressable::URI

def self.unencode(uri, returning=String)
  return nil if uri.nil?
  begin
    uri = uri.to_str
  rescue NoMethodError, TypeError
    raise TypeError, "Can't convert #{uri.class} into String."
  end if !uri.is_a? String
  if ![String, ::Addressable::URI].include?(returning)
    raise TypeError,
      "Expected Class (String or Addressable::URI), " +
      "got #{returning.inspect}"
  end
  result = uri.gsub(/%[0-9a-f]{2}/i) do |sequence|
    sequence[1..3].to_i(16).chr
  end
  result.force_encoding("utf-8") if result.respond_to?(:force_encoding)
  if returning == String
    return result
  elsif returning == ::Addressable::URI
    return ::Addressable::URI.parse(result)
  end
end