Body of the 'Expand' user macro is not included in a PDF export

In Confluence 3.4, we added support for the {expand} user macro and made the code available for administrators to add to their wikis.

In Confluence 3.5, we plan to ship the {expand} user macro with Confluence.

The problem: When you export pages to PDF, the text between the macro tags is not visible. This is a problem for the Atlassian documentation, and also for any customers who use the {expand} user macro and export their pages to PDF.