* check for nil
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* handle tombstone
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* move casting to caller. add comments.
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* more sanding
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* more scrubbing
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* move object unwraping to switch cases
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* oops remove debug
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* remove cruft
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>