how to include newlines in StreamingMarkupBuilder output?

I switched from MarkupBuilder to StreamingMarkupBuilder in order to create mixed content, which works great. But the resulting text output is a single long line of text, unlike the output from MarkupBuilder. Any suggestions on how to make the output of StreamingMarkupBuilder have newlines in it? I tried to find documentation for StreamingMarkupBuilder and was unsuccessful. Downloaded the source code but it is uncommented, and looking at the code for this class didn't give me any insights.

-Walter Gillett