Promises causing memory leaks

promises.js

function bad() {
  var promise = somethingAsync();
  
  promise.finally(function () {
    logSomeThings();
  });

  promise = promise.then(function (result) {
    return transform(result);
  });

  return promise;
}


function good() {
  var promise = somethingAsync();
  
  promise = promise.finally(function () {  // <-- only changed line
    logSomeThings();
  });

  promise = promise.then(function (result) {
    return transform(result);
  });

  return promise;
}

@kriskowal: having some difficulty repro'ing the error right now (the original leak was very slow and was only visible under production load -- fun!). I'll trying boiling it down to the raw test case above and update tomorrow.