This file is indexed.

/usr/lib/nodejs/es5-ext/function/is-arguments.js is in node-es5-ext 0.10.30-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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"use strict";

var objToString = Object.prototype.toString
  , id = objToString.call(
	(function () {
		return arguments;
	})()
);

module.exports = function (value) {
	return objToString.call(value) === id;
};