Certain shapes of Observer behavior can cause an uncought error in Marbizer.marblize

[bulldog98]

If you pass in, which I managed to find out in a test case of mine, it passes -3 into repeat.

it('should work', () => {
  const values = { a: 1, b: 2, c: 3, d: 4 }
  const base = merge(cold('-ac', values), cold('-bd', values));

  expect(base).toBeObservable(cold('-(ab)(cd)', values))
})

is a minimal example how that is achieved