// Thanks for hints: https://github.com/paulmillr/es6-shim
  
  'use strict';
  
  var some = Array.prototype.some, abs = Math.abs, sqrt = Math.sqrt
  
    , compare = function (a, b) { return b - a; }
    , divide = function (x) { return x / this; }
    , add = function (sum, number) { return sum + number * number; };
  
  module.exports = function (val1, val2/*, …valn*/) {
  	var result, numbers;
  	if (!arguments.length) return 0;
  	some.call(arguments, function (val) {
  		if (isNaN(val)) {
  			result = NaN;
  			return;
  		}
  		if (!isFinite(val)) {
  			result = Infinity;
  			return true;
  		}
  		if (result !== undefined) return;
  		val = Number(val);
  		if (val === 0) return;
  		if (!numbers) numbers = [abs(val)];
  		else numbers.push(abs(val));
  	});
  	if (result !== undefined) return result;
  	if (!numbers) return 0;
  
  	numbers.sort(compare);
  	return numbers[0] * sqrt(numbers.map(divide, numbers[0]).reduce(add, 0));
  };