missing context in nested describe's tests when using beforeAll

gistfile1.js

var buster  = require('buster')

buster.spec.expose()

describe('Outer', function() {
  beforeAll(function() {
    this.foo = 1
    console.log('outer beforeAll', this.foo)
  })

  before(function() {
    this.bar = 1
  })

  afterAll(function() {
    this.foo = 2
    console.log('outer afterAll', this.foo)
  })

  after(function() {
    this.bar = 2
  })

  describe('Inner', function() {
    it("does things", function() {
      console.log('in the test -> foo', this.foo) // this.foo is gone
      console.log('in the test -> bar', this.bar)
      expect(this.bar).toEqual(1)
      expect(this.foo).toEqual(1)
    })
  })
})