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Passing (just) other options, when using pgfopts

I want to use pgfopts (and therefore pgfkeys) when customizing a class with new options, keeping the old ones, and using some of them. Here is a simplified example with a class "exa" which extends ...
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How can I pass class/package options with spaces in values? [duplicate]

Possible Duplicate: Spaces in pfgopts options I have read Joseph Wright's excellent article on key-value systems, as well as questions on this site about how to pass arguments to class ...