Further clarification regarding white-space collapse needed

Can anyone clarify whether white space is supposed to collapse through format characters #x202A, #x202B, #x202C, #x202D, #x202E (for normal, nowrap and pre-line values of white-space properties). 

It is not clear for me from current spec and different browsers handle such cases differently, for example
A ‮ C B‬D
in Opera 9.5 and Safari 3 looks like
A B C D
as they don't collapse space through format characters. In Mozilla it looks like:
A B CD

The question is which interpretation is right and whether it can be clarified in spec?

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Received on Thursday, 20 September 2007 14:50:09 UTC