Comment 3 for bug 1274155

The referenced change serializes all non-string values to JSON when they are passed to nova. I have updated test_server_update_nova_metadata (and _with_delete) to check this, but I did not otherwise see a good location for documentation in this repository. If this patch or similar is accepted, it seems as if the rigth place for documentation would be http://docs.openstack.org/developer/heat/template_guide/openstack.html#OS::Nova::Server (and I'm happy to take care of submitting a patch for that if necessary).