It is nice to be able to choose ⅓ and ⅔ split, ¼ and ¾ split, the way core layout builders column layouts do, without having to add custom classes (which we aren't doing yet anyway).
Rather than figuring out how core is doing this and replicating it, which likely involves trying to reconcile the classes used there with the LayoutOptions class, it would be faster for us to simply add a layout options select option with the same options core does, scoped to the relevant layout as planned for custom classes in ✨ Allow custom classes on each column Active
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