Bi-directional xdcr conflict resolution during insert with the same key

Hi , could you please explain , how conflict resolution will works if
two documents with The same KEY will be inserted from different data centers.
and then bi-derectional replication will start its work.
How conflict will be resolved ?
I’ve read the doc
But here I see only update/mutation cases and not insert operation.

So I am interested if there will be insert operation with the same key from both data centers.

As far as I know, an insert is just another type of mutation, so it will resolve it the same way.