Low-level list item serializer
function ListItemSerializer(props) {
    const children =
      !props.node.style || props.node.style === 'normal'
        ? // Don't wrap plain text in paragraphs inside of a list item
          props.children
        : // But wrap any other style in whatever the block serializer says to use
          h(props.serializers.types.block, props, props.children)

    return h('li', null, children)
  }