Avoid using extra markup via <template />

[codev0]

Hi there,
Why svelte doesn't support template tag?
I wanted to use them for avoiding extra markup with slots.
Please look to examples above,

With extra markup:

// Wrapper.svelte
<div>
	<slot name="content" />
</div>

<Wrapper>
	<div slot="content">
		Content
	</div>
</Wrapper>

With template tag for avoid extra markup:

<Wrapper>
	<template slot="content">
		Content
	</template>
</Wrapper>

Without extra markup, but with error 'slot' is reserved for future use in named slots

<Wrapper>
	<Field slot="content" />
</Wrapper>

REPL https://svelte.dev/repl/8ad8f71a5f5c48039d6be62e88ad07f8?version=3.5.1

By whatwg spec

The template element is used to declare fragments of HTML that can be cloned and inserted in the document by script.
In a rendering, the template element represents nothing.

[Conduitry]

Duplicate of #2080. <template slot='foo'> is one of the syntaxes that was proposed in that ticket.

ALso slot as a prop name was specifically disallowed so that sometime in the future that last syntax could be added without it being a breaking change.