Elements with null values not treated consistently

[jbasiago]

This is a really great tool. However, I ran into an issue while trying to create documents that had iterations over their structure. I couldn't figure out how to build them with the concatenated element approach, so I used the object approach instead. But I found that elements are not treated consistently between them. Here is demonstration code:

var builder = require('xmlbuilder');

var doc1 = builder.create('doc');
doc1.ele("parent").
    ele("listItem").
    ele("child1", "present").up().
    ele("child2", null).up().up().
    ele("listItem").
    ele("child1", "present").up().
    ele("child2", null);
console.log(doc1.toString({pretty: true}));

var doc2 = builder.create('doc');
var contents = {
    parent: {
        '#list': [
            {
                listItem: {
                    'child1': "present",
                    'child2': null
                }
            },
            {
                listItem: {
                    'child1': "present",
                    'child2': null
                }
            }
        ]
    }
};
doc2.ele(contents);
console.log(doc2.toString({pretty: true}));

I need the resulting document to look like the doc1 results when there are null values in the data. Can you help with this? Is there a way to use the concatenated ele() calls to produce a variable number of listItems in the structure?

Thanks,

[jbasiago]

<doc>
  <parent>
    <listItem>
      <child1>present</child1>
      <child2/>
    </listItem>
    <listItem>
      <child1>present</child1>
      <child2/>
    </listItem>
  </parent>
</doc>

<doc>
  <parent>
    <listItem>
      <child1>present</child1>
    </listItem>
    <listItem>
      <child1>present</child1>
    </listItem>
  </parent>
</doc>

[oozcitak]

Iterations can be done as follows:

var doc1 = builder.create('doc');
var parent = doc1.ele("parent");
for(var i = 1; i <= 2; i++)
{
  parent.ele("child1", "present").up()
    .ele("child2", null)
}