thank you for emailing us. this is now fixed.
Has this fix since regressed? Today, on OS X (also case insensitive) I am getting the same error when trying to checkout the docs:svn checkout http://closure-library.googlecode.com/svn/docs closure-docs...svn: In directory 'closure-docs'svn: Can't open file 'closure-docs/.svn/tmp/text-base/class_goog_history_Event.html.svn-base': No such file or directory
class_goog_history_Event.html