Cancel state transition when exception is thrown inside observer #184
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If the state was already mutated, the state goes back. If it is a promise, then it catches the promise exception, reverts the state, and throws the error again.
when an error is thrown inside an observer
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#171 related
When you throw an exception inside an observer the FSM state might be updated:
This PR makes this consistent, and it always reverts the state.
It basically reverts to the previous state when the exception is thrown IF the current state is different from the previous one, defined in the transition.
Promises supported