According to https://library.vuforia.com/content/vuforia-library/en/articles/Solution/arcore-with-vuforia.html, in order to take advantage of ARCore when using Vuforia I should "Make sure ARCore is configured to be “Optional” or “Required” in the Vuforia Configuration."
However, after downloading arcore.aar (I tried both with versions 1.4 and 1.10), making sure that "Android" is checked under "Select platforms for plugin" and selecting POSITIONAL tracking mode in Vuforia Configuration, the option "ARCore requirement" does not appear.
I am using Unity 2019.1.1
Is there anything that I am missing? Should I enable it in the manifest directly?