[w3c/FileAPI] Why are Blob() and File() constructors at Chromium 81 throwing RangeError? (#147)

The specification does not mention `RangeError` once, yet when testing `video.requestAnimationFrame()` found that images converted to `Blob`s then `Uint8Array`s (with `createImageBitmap()` and `OffscreenCanvas.convertToBlob()`) and stored in an `Array` when that `Array` is passed to `Blob()` or `File()` constructors a `RangeError` is consistently thrown

```
RangeError: Invalid string length
            Array.join (<anonymous>)
            Array.toString (<anonymous>)
```
plnkr to demonstrate https://plnkr.co/edit/NVTsnAjSTf0h1qYy?preview, Chromium bug https://bugs.chromium.org/p/chromium/issues/detail?id=1063681.

This is the first time that have observed such behaviour when using File API. What is the cause of the `RangeError` being thrown in this case?


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