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

Well, 3) is just the same as 2). But yes, 2/3 and 4 are both worth investigating.

I guess my issue is that 4 is a general problem with every web API ever; if you move portions of it into C++, there are less allocations and GCs. In the end why don't we just write all our code in webasm...

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