Mesh.optimize() removed in Unity 5.6?

The script reference states that mesh.optimize has been removed in Unity 5.6, is there any equivalent function now?

It’s on by default in the import mesh settings.

I think it was said by a dev during the beta that the function had no use anymore as it did not really do anything(?)

For editor use there is Unity - Scripting API: MeshUtility.Optimize