Re: [WICG/webcomponents] Proposal: a native solution for virtual scrolling (#791)

> The alternative would be using 64bit numbers but that'd have a major impact on memory usage.

I don't think it's necessary to use 64-bit numbers, which is not a complete solution to the problem idea.
It is well known that 64-bit numbers are simply two 32-bit numbers combined.
So why not just go ahead and do it that way?
```
ele.addEvent('scroll', event=>{
  // default = 0n
  ele.scrollTopHeight
  const bigScrollTop = ele.scrollTopHeight << 32n + BigInt(event.scrollTopHeight);
});
```

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