This file is indexed.

/usr/share/doc/phantomjs/examples/fibo.js is in phantomjs 2.1.1+dfsg-2.

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 fibs = [0, 1];
var ticker = window.setInterval(function () {
    console.log(fibs[fibs.length - 1]);
    fibs.push(fibs[fibs.length - 1] + fibs[fibs.length - 2]);
    if (fibs.length > 10) {
        window.clearInterval(ticker);
        phantom.exit();
    }
}, 300);