Re: [WICG/webcomponents] [templates] A declarative JavaScript templating API (Issue #1069)

Getting back to the issue that @NullVoxPopuli raises...what if we could introduce the idea of lazy evaluation to tagged template literals? For example, `${value}` is the same eager evaluation that we have today, but `{value}` could be lazily evaluated. Essentially, it would get converted to something like `${() => value}` under the hood. It's maybe too late to change tagged template literals, as that would be a break, but maybe a new literal type with three backticks or similar could enable this. Or what if the tagged template function itself could opt into this interpretation somehow?

Obviously, this then becomes a TC39 thing, which complicated matters. But it seems to me that tagged template literals could be a lot more powerful if that part of the language were explored more.

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