jsontoxml produces wrong result with nested multi-dimensional arrays

A json doc with a multi-dimensional array below the root level will have its elements flattened rather than nested in the xml. For example:

is producing 1,2,3,4 as siblings rather than nested as:

<foo>
<foo>1</foo>
<foo>2</foo>
</foo>
<foo>
<foo>3</foo>
<foo>4</foo>
</foo>