Projection not working properly for deep nested objects

[nkemtasoft]

First, thanks for building this amazing library. It's been of an invaluable help to me.

So, there's this issue I've encountered while working with mingo. When I apply this projection rules

{ 'comments.title': 0, 'comments.comments.comments': 0, numbers: 0 }

on this object

{
  "_id": "639b4a1dc9414e958b1484ba",
  "title": "mingo is cool",
  "numbers": [],
  "owners": [],
  "comments": [
    {
      "title": "a",
      "body": "body",
      "comments": []
    },
    {
      "title": "b",
      "body": "body",
      "comments": [
        {
          "title": "c",
          "comments": []
        }
      ]
    }
  ],
  "text": "kandinsky"
}

I get this result

{
  "_id": "639b4a1dc9414e958b1484ba",
  "title": "mingo is cool",
  "owners": [],
  "comments": [
    {
      "body": "body",
      "comments": []
    },
    {
      "body": "body",
      "comments": [
        {
          "title": "c",
          "comments": []    // <-- this shouldn't be included
        }
      ]
    }
  ],
  "def": "kandinsky"
}

The issue is that this rule 'comments.comments.comments': 0 should not include the last level "comments": [] (where the title is "c") but it does.

[kofrasa]

Thanks for reporting this bug @nkemtasoft