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* Ensures that onFulfilledOrRejected will be called regardless of whether
* this promise is fulfilled or rejected.  onFulfilledOrRejected WILL NOT
* receive the promises' value or reason.  Any returned value will be disregarded.
* onFulfilledOrRejected may throw or return a rejected promise to signal
* an additional error.
* @param {function} handler handler to be called regardless of
*  fulfillment or rejection
* @returns {Promise}
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