How to switch css-Obfuscation ON?

i know how to switch css obuscation off:

<set-configuration-property name="CssResource.style" value="pretty"/>

this is don in my default gwt.xml. But how to turn it on again - in my ci.gwt.xml/ release.gwt.xml? i asked this already at stackoverflow but it seems to be a very hard question?!

So what values could be asigned to "CssResource.style" and what value is the default value - the value that activates the obfuscation?

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