Other than the Template Instantiation proposal, which of the technologies above aren't in the specs folder of that repo? Beyond that (which is noted very clearly as a proposal) everything else is 100% ready, as outlined in the article. What's more, discussion of the Template Instantiation proposal, and the benefits that will bring are have in the context of a production ready libraries that do similar work and specifically one that builds on the capabilities of the spec in anticipation of its arrival due to strong support across browser vendors and the developer community.
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