By default, identity is the place in the vDOM tree (taking `null` nodes into account so that you can have conditional nodes in fragments/children lists). In li

By default, identity is the place in the vDOM tree (taking `null` nodes into account so that you can have conditional nodes in fragments/children lists). In lists, identity can instead be tracked by a user-provided key: https://reactjs.org/docs/lists-and-keys.html https://reactjs.org/docs/lists-and-keys.html