!! should not break !!
> Internally, with the builder this is something like
>
> ```rust
> Element {
>   tag: "main",
>   attrs: vec![("class", "text-center")],
>   children: vec![
>     Element {
>     tag: "div",
>     attrs: vec![("class", "flex-col")],
>       children: vec![
>         Element {
>           tag: "button",
>       attrs: vec![],
>       children: vec!["Click me"]
>         },
>         Element {
>           tag: "p",
>       attrs: vec![("class", "italic")],
>       children: vec!["Text"]
>         }
>       ]
>     }
>   ]
> }
> ```
>
> This is a _bunch_ of small allocations and separate strings,
> and in early 0.1 versions we used a `SmallVec` for children and
> attributes and actually caused some stack overflows.
>
> But if you look at the view itself you can see that none of this
> will _ever_ change. So we can actually optimize it at compile
> time to a single `&'static str`:

[expect]
> Internally, with the builder this is something like
>
> ```rust
> Element {
>   tag: "main",
>   attrs: vec![("class", "text-center")],
>   children: vec![
>     Element {
>     tag: "div",
>     attrs: vec![("class", "flex-col")],
>       children: vec![
>         Element {
>           tag: "button",
>       attrs: vec![],
>       children: vec!["Click me"]
>         },
>         Element {
>           tag: "p",
>       attrs: vec![("class", "italic")],
>       children: vec!["Text"]
>         }
>       ]
>     }
>   ]
> }
> ```
>
> This is a _bunch_ of small allocations and separate strings,
> and in early 0.1 versions we used a `SmallVec` for children and
> attributes and actually caused some stack overflows.
>
> But if you look at the view itself you can see that none of this
> will _ever_ change. So we can actually optimize it at compile
> time to a single `&'static str`: