old_contents: var kindOf = require('./kindOf')
  
  function isArray (value) {
    return Array.isArray(value) || kindOf(value) === 'array'
  }
  
  module.exports = isArray
  
new_contents: function isArray (value) {
    return Object.prototype.toString.call(value) === '[object Array]'
  }
  
  module.exports = isArray
  
subject: update lang/isArray