What is the issue with the Infra Standard?

The Notifications spec tries to consume only the initial part of a list:

20. For each entry in options["actions"], up to the maximum number of actions supported (skip any excess entries):

Would be nice to have an infra term so that it could be something like (the grammar chosen randomly):

20. For each entry in the slice(0, 2) of options["actions"]

Edit: 666 😲