text: const ThunkyMap = require('./')
  
  const t = new ThunkyMap(function (key, cb) {
    console.log('loading...', key)
    setTimeout(() => cb(null, key), key)
  })
  
  t.get(1000, console.log)
  t.get(100, console.log)
  
  setTimeout(function () {
    t.get(1000, console.log)
  }, 2000)
  