What would you recommend for robust data storage please?
Depends. In theide, some text format with C lexical basics is prefered (e.g. for .upp files).
Maybe XML.
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Is there a way to search for specific "key" values in the stream which might then act as delimiters between classes?
No.
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I am getting close to launch and people are testing and already asking for backwards compatibility which I know from experience just leads to more and more complication.