code: function addNumeratorsTogether(node) {
    const newNode = clone(node);
  
    newNode.args[0] = Node.Creator.constant(newNode.args[0].eval());
    return Node.Status.nodeChanged(
      ChangeTypes.ADD_NUMERATORS, node, newNode);
  }
docs: Given a node with a numerator that is an addition node, will add all the numerators and return the result