And I was replying to your comment:
where is this fairly significant new feature documented?
This SHOULD get documented and noted in the release notes when this hits RC, as it’s a major feature. But I’m pretty sure they’re not going to include a way to disable it in the admin side. Right now it’s a beta announcement, for people who are brave, daring, a little masochistic, and adventurous. You did a good thing, posting the suggestion in the forum, and since it’s not a bug, it’s not worth a trac ticket. Maybe email wp-testers with a suggestion, but basically I wouldn’t stress TODAY about something not being clearly documented in the beta.
And yeah, trac is a confusing thing. Once there’s a way to disable this in a define statement (which goes in your wp-config), the codex will be updated and this page will have some more info: https://codex.www.ads-software.com/Version_3.1
Cart comes after the horse ?? Don’t update the doc until you’ve locked down the features ??