firebase-tools: Firestore emulator sending incorrect event payloads to Functions emulator

I just ran a real Cloud Function (non-Firebase) triggered on onWrite for the document foo/bar.

I created the document (no previous data) and logged out the two arguments to the function and got this:

context

{
    eventId: "6e7a9aae-5e22-4414-abaf-cb6b0a3363a2-0",
    eventType: "providers/cloud.firestore/eventTypes/document.write",
    notSupported: {},
    resource: "projects/fir-dumpster/databases/(default)/documents/foo/bar",
    timestamp: "2019-05-14T01:49:26.587519Z",
}

data

{
    oldValue: {},
    updateMask: {},
    value: {
      createTime: "2019-05-14T01:49:26.587519Z",
      fields: {
        hey: {
          stringValue: "now",
        },
      },
      name: "projects/fir-dumpster/databases/(default)/documents/foo/bar",
      updateTime: "2019-05-14T01:49:26.587519Z",
    },
}

However if I do the same thing in the emulator suite I get:

context

{
  "eventId": "68ded781-de59-4adb-aff2-a8b6597a9725",
  "timestamp": "2019-05-14T01:59:17.900Z",
  "eventType": "providers/cloud.firestore/eventTypes/document.write",
  "resource": {
    "name": "projects/fir-dumpster/databases/(default)/documents/foo/bar",
    "service": "firestore.googleapis.com"
  }
}

data

{
  "value": {
    "name": "projects/fir-dumpster/databases/(default)/documents/foo/bar",
    "fields": {
      "hello": {
        "stringValue": "world"
      }
    },
    "createTime": "2019-05-14T01:59:17.900Z",
    "updateTime": "2019-05-14T01:59:17.900Z"
  },
  "updateMask": {}
}

The difference is that in the emulator we get context.resource is an Object and in prod we get context.resource is a String.