jest-jasmine2 can't print errors that are not an Error

[wmertens]

Do you want to request a feature or report a bug?

feature that is in jasmine since v2.6

What is the current behavior?

When a non-error is thrown, jest-jasmine2 turns it into "[Object object]", making it hard to debug. See https://github.com/facebook/jest/blob/1a51672c7597d900953a0b95e4430e65eaa04259/packages/jest-jasmine2/src/jasmine/Env.js#L551-L554

What is the expected behavior?

jasmine has this code: jasmine/jasmine@8807bbb#diff-f41e57b2889bae3046aa9f352699785c

I would expect non-Error exceptions to be formatted as such. This is a valid coding pattern. E.g. React will throw a Promise in the proposed Suspense API.

[SimenB]

Tracked in #3839.

PR welcome!

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