`@` stripped from attribute values in SSR mode

[Conduitry]

<a href='mailto:hello@example.com'>email</a>

when run through the compiler in SSR mode produces

...
return `<a href="mailto:helloexample.com">email</a>`.trim();
...

[Conduitry]

Looking at the code for this, I noticed something else: double quotes in attribute values in SSR are also not handled well -

<span title='"foo"'>foo</span>

produces

...
return `<span title=""foo"">foo</span>`.trim();
...