fix(ssr): fix rendering of spellcheck attribute

[nolanlawson]

Details

Does what it says on the tin.

Does this pull request introduce a breaking change?

• 😮‍💨 No, it does not introduce a breaking change.

Does this pull request introduce an observable change?

• 🤞 No, it does not introduce an observable change.

[wjhsf]

Do we need to deal with draggable?

[nolanlawson]

In this case no because we are merely following what the template compiler currently does, which is to munge string literals for spellcheck into a boolean.

Since there's no reflection involved here, there is strictly no need to do anything with draggable unless we also want to change the template compiler (which of course has ramifications for backwards compat).

Well maybe yeah. In this case spellcheck is being treated as a prop. We may need to investigate draggable.

[nolanlawson]

Yeah I think #4864 demonstrates that we munge all spellcheck literals into pseudo-booleans (spellcheck="true"/spellcheck="false") when we should probably do the same thing for draggable since it's the same thing with the default inverted.

[nolanlawson]

I don't have the brain cells for this right now at 4pm, but filed a bug: #4870