Might/probably will need work in core as well (though arguably this is more useful on the server? not sure)

For a project that's using SSR + hydration, I'd love for this to work the same during both static rendering and on the client!

For a project that's using SSR + hydration, I'd love for this to work the same during both static rendering and on the client!

It should "hydrate" just fine as-is, by virtue of not actually having anything to hydrate; there's no hydrating non-Preact components and we don't wipe out the DOM on mismatches. Hydrating<Fragment dangerouslySetInnerHTML={{ __html: '<h1>Hello World!</h1>' }}> is basically a no-op.