text: /*!
   * is-number <https://github.com/jonschlinkert/is-number>
   *
   * Copyright (c) 2014-2015, Jon Schlinkert.
   * Licensed under the MIT License.
   */
  
  'use strict';
  
  var typeOf = require('kind-of');
  
  module.exports = function isNumber(num) {
      var type = typeOf(num);
      if (type !== 'number' && type !== 'string') {
          return false;
      }
      var n = +num;
      return (n - n + 1) >= 0 && num !== '';
  };
  