Additional TrackedArray test to ensure that clearing the array by setting length = 0 is possible.

[ksrb]

Added a minor test case, something I wanted to make sure wasn't breaking, feel free to close if redundant.

[chriskrycho]

Hey @ksrb, thanks for opening this!

I will take a look at the test, and don't mind adding it in principle, but the way the library works we would have to go out of our way to make this not work. All "set" operations run through the proxy that intercepts access, so we'd have to be special-casing setting length to prevent it from being cleared!

Did you hit something that made you doubt this?

[ksrb]

Did you hit something that made you doubt this?

No it works fine in the project I'm working on just wanted to be sure it's more like I saw a similar test and though it would be nice to have as a form of 'documentation' 😄 .

'Similar test'

  test('Can set length on array directly', (assert) => {
    let arr = new TrackedArray();
    arr.length = 123;
    assert.equal(arr.length, 123);
  });

[chriskrycho]

Doesn't hurt to have it! 😄