Javascript | Proxy | Handler.get() method is not setting target objects properties

var target = {}

var handler = {
  get (target, key) {
    console.info('get')
    return target[key]
  },
  set (target, key, value) {
    console.info('set')
    return true
  }
}

var proxy = new Proxy(target, handler)

proxy.a = 'a' //prints 'set'
console.info(proxy.a); // prints 'get'
// <- undefined

I was trying to understand the Javascript Proxy API and decided to try some code myself. I have defined an empty target to and a handler with a set and get traps. My set and get traps work perfectly fine and they're invoked everytime I set or get a property. But the last console.info statement prints an undefined. The only fix I found is to add a target[key] = value; just above the return statement in the set trap. But I'm pretty sure that's not correct. Can anyone help me figure out why I can't set a property using the proxy here? Thanks in Advance :)