code: private void addChildNode(final Builder builder, final String name, final Object value) {
          assert !(value instanceof List);
  
          final Builder childBuilder = new Builder();
          // Set the name of the child node.
          childBuilder.name(name);
          // Set the value of the child node.
          final ImmutableNode childNode = toNode(childBuilder, value);
          // Add the node to the children of the node being built.
          builder.addChild(childNode);
      }
docs: Adds a child node to the specified builder.
  
  @param builder The builder to add the node to.
  @param name The name of the node.
  @param value The value of the node.