Component Performance Tweaks #12289
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Component Performance Tweaks #12289
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Previously, we tried to restrict which attributes we set eagerly, and clean up the rest using unknownProperty. However, over time, making that work correctly has gotten more and more complicated, and the cost of the laziness is more than the benefits. This commit goes back to an eager setting strategy, eliminates unknownProperty and the reliance on _internalDidReceiveAttrs. It leaves a setter interceptor for propagating sets to mutable cells.
Similar to `meta`, this commit restructures the scope away from pervasive use of `Object.create` into a custom JavaScript object. This has two benefits: 1. We only need a single parent pointer, rather than having every map inherit from its parent map. 2. v8 penalizes us for using `Object.create` by often assuming we are creating something more class-like and eventually blowing up methods that use scopes. Eventually, this scope refactoring will probably replace some of the hooks in HTMLBars.
This allows us to lazily create the state bucket for each morph, and avoids creating a ton of extra objects that are unused.
Also, ensure `EMPTY` has the same object shape as `Scope`.
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This is a rebase/cleanup of #12286.
Performance comparison of initial render performance (mean of 50 runs each) using https://github.com/ef4/initial-render-perf and latest Chrome:
Full details in https://gist.github.com/rwjblue/5d9e7b71fa30f6f45e55.