Option to not make the named slot a child of a node

[TheComputerM]

Is your feature request related to a problem? Please describe.
There should be some option to not bind the slot to any node:

<div class='test'><slot name="test" /></div>

and the input:

<p slot="test">Hello <b>World</b></p>

and the output is:

<div class='test'><p slot='test'>Hello <b>World</b></p></div>

But, there is no way to get something like this with using named slots:

<div class='test'>Hello <b>World</b></div>

Describe the solution you'd like
I would prefer for something like this:

<p slot="test" slot:node={false}>Hello World</p>

So the p element will not be added to the slot, but just the content.

How important is this feature to you?
Important, as this causes many problems with component composition and flexbox.

[TheComputerM]

With this we can also do something like:

<div slot="test" slot:node={SvelteComponent}>
  This will be wrapped in `SvelteComponent`
</div>

[PatrickG]

There is a rfc and a pr that's waiting to be merged.

[TheComputerM]

Does this mean the PR will be merged in the next minor version of svelte?

[Conduitry]

No, but it means this is a duplicate of #2079.