Re: [fxtf-drafts] [geometry] point.matrixTransformSelf (#325)

Oh I see. Yeah, the `*self` functions were introduced to chain the transformations:

```js
matrix.translateSelf(...).scaleSelf(...).rotateSelf(...);
```

So we probably didn't thought about other use cases at the time. Also, creating new instances of matrix with 16 slots (and another for is2D) is heavier than transformations on `DOMPoint`. I still see value on `*Self` in general though.


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