Differences are vanished in error output message

[bence-balogh-intland]

Hi guys,
Please consider the following test case:

    it.only('should whatever', () => {
        const result$ = cold('-a--|', {
            a: { prop: NaN }
        });

        const expectedResult$ = cold('-a--|', {
            a: { prop: null }
        });

        expect(result$).toBeObservable(expectedResult$);
    });

The 2 prop obviously differs, so the test case will fail.
Unfortunately, the difference is vanished from the output message, since during stringification of frames, NaN becomes null:

The differences should be highlighted as follows:

Could you please check?

Thanks,
Bence

[bence-balogh-intland]

Probably same issue as in:
#88

[NiklasPor]

One of the few reasons jest-marbles may be used over jasmine-marbles is that due to the output of jasmine-marbles it's nearly impossible to compare complex observables.

Here a simple comparison:

jasmine-marbles (running with jest) ⬇️

jest-marbles (also running with jest) ⬇️

As you can see, it's way easier to detect what went wrong inside the test-case with the better formatted print, highlighting and fifing