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git-svn-id: http://blockly.googlecode.com/svn/trunk@1710 c400ca83-b69d-9dd7-9705-49c6b8615e23
Stringify property names so they survive compilation.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1711 c400ca83-b69d-9dd7-9705-49c6b8615e23