$format doesn't work in XML::LibXML::Document->toString($format)

According to:
http://search.cpan.org/~pajas/XML-LibXML-1.70/lib/XML/LibXML/Document.pod

  toString is a DOM serializing function...

  The optional $format parameter sets the indenting of the output.
  ...
  If $format is 1, libxml2 will add ignorable white spaces, so the nodes
  content is easier to read. Existing

Yet when I call $doc->toString(1) I get back a string of XML with no
whitespace between tags.

I read here:
http://www.perlmonks.org/index.pl/?node_id=490846

  In theory, you can call toString(1) to specify you want indents added,
  but I haven't had any success with that.

So I'm not the only one who has observed this. But that's an old article
(2005), and I'm using an older XML::LibXML (1.65 2007) with an equally
old libxml2 (libxml2-2.6.26 2006). I didn't spot anything relating to
toString in the libxml2 change log (http://xmlsoft.org/news.html).

Anyone know if this issue is specific to the old version?

 -Tom

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