Re: [dom] MutationObserver with querySelector for elements (#77)

> It's not worth it to add an API to the platform if the only benefit is less "noise" to the mutation observer callbacks; you can write a trivial wrapper library to handle that. The benefit would be if there are real performance advantages, which is why I was hoping to see benchmarks.

Gotcha. Ok. I'd need help from someone with platform experience to write a shim for me and I'll be happy to test that!

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