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/usr/lib/nodejs/es5-ext/object/ensure-finite-number.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 isFiniteNumber = require("./is-finite-number")
  , safeToString   = require("../safe-to-string");

module.exports = function (value) {
	if (isFiniteNumber(value)) return Number(value);
	throw new TypeError(safeToString(value) + " does not represent a finite number value");
};