Yay, seems like the choo thunking fix is working. Widgets will now work reliably && rendering will get ridiculous 
pic.twitter.com/kXQAOoLHpp
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Choo was already "not slow" - caveat was we couldn't instrument the diffing algo to stop diffing a certain branch. Now we can
The instrumentation of the DOM is analogous to React's "shouldComponentUpdate" - we achieve this by proxying nodes thru `node.isSameNode()`
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e.g. if (memoizedEl) { const dummyEl = html`<div></div>`; dummyEl.isSameNode = (el) => el.isSameNode(memoizedEl); return dummyEl } //
Thanks. Twitter will use this to make your timeline better. UndoUndo
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