docs: def getExerciseDetails(self, identifier):
          """Gets the details for a particular exercise.
  
          """
          exercise = self._getExercise(identifier)
          response = {
              b"identifier": exercise.identifier,
              b"title": exercise.title,
              b"description": exercise.description,
              b"solved": exercise.wasSolvedBy(self.user)
          }
          return response