I have JS array which stores QModelIndexes

root.selectedIndexes.push(index)
console.log(selectedIndexes)

outputs
[QModelIndex(0,0,0x55e8cb5b5310,TreeModel(0x55e8cb5b2a80))]

if after that check console.log(root.selectedIndexes.includes(index)) outputs false. Why?

however console.log(root.selectedIndexes.indexOf(index)) gives 0

I works as expected with other data types as String or int.

Qt version is 5.12.8