code: function reduceMultiplicationByZero(node) {
    if (node.op !== '*') {
      return Node.Status.noChange(node);
    }
    const zeroIndex = node.args.findIndex(arg => {
      if (Node.Type.isConstant(arg) && arg.value === '0') {
        return true;
      }
      if (Node.PolynomialTerm.isPolynomialTerm(arg)) {
        const polyTerm = new Node.PolynomialTerm(arg);
        return polyTerm.getCoeffValue() === 0;
      }
      return false;
    });
    if (zeroIndex >= 0) {
      // reduce to just the 0 node
      const newNode = Node.Creator.constant(0);
      return Node.Status.nodeChanged(
        ChangeTypes.MULTIPLY_BY_ZERO, node, newNode);
    }
    else {
      return Node.Status.noChange(node);
    }
  }
docs: If `node` is a multiplication node with 0 as one of its operands, reduce the node to 0. Returns a Node.Status object.