code: function orderedItems(node) {
    var self = this
    var fn = self.visitors.listItem
    var increment = self.options.incrementListMarker
    var values = []
    var start = node.start
    var children = node.children
    var length = children.length
    var index = -1
    var bullet
  
    start = start == null ? 1 : start
  
    while (++index < length) {
      bullet = (increment ? start + index : start) + dot
      values[index] = fn.call(self, children[index], node, index, bullet)
    }
  
    return values.join(node.spread ? blank : lineFeed)
  }
docs: Visit ordered list items.  Starts the list with `node.start` and increments each following list item bullet by one:  2. foo 3. bar  In `incrementListMarker: false` mode, does not increment each marker and stays on `node.start`:  1. foo 1. bar