I have 2 collections:

• Foo (_id, bars[])
• Bar (_id)

`bars` is the array of `Bar`'s ObjectId.

I would like to use `lookup` to get the array of `Bar` in EXACTLY order that the Id stored in `bars`.

{
	$lookup: {
		from: 'bars',
		localField: 'bars,
		foreignField: '_id',
		as: 'bars'
	}
}

Everything are ok, UNTIL I $push another Bar's ObjectId to BEGIN of the `bars` array. The $lookup will returns the array which the new one is in the end of array, NOT begin of array as my expectation.

For example:

{
	_id: ...,
	bars: [A_id, B_id]
}

=> A, B
But, after $push C_id to BEGIN of array:

{
	_id: ...,
	bars: [C_id, A_id, B_id]
}

=> A, B, C
And so on for D_id => A, B, C, D

My expectation is: A, B, C, D.