Re: [w3c/webcomponents] [templates] Allow removal of boolean attributes (#705)

Options:

* Treat particular falsey values magically. One or more of `false`/`undefined`/`null` should, if they're the only value of the attribute, remove/not-add the attribute.
* Invent special syntax to enable special treatment of the value, eg `{{falseVal?}}`, otherwise always treat as string.
* Invent special parser behaviour, such as `checked={{falseVal}}` vs `checked="{{falseVal}}"`, where only the former would allow the special treatment of the value.

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