Not the right person to give a qualified answer to your question, but bare record parameters in method signatures are kind of a problem throughout various parts of the standard FPC and Lazarus libraries, I've noticed.
It almost makes me think the either the compiler should perform the kind of optimization it does with const/var/constref implicitly no matter what, or it should just not allow you to specify methods without them at all. What's the point in having a way of doing something that is guaranteed to always give worse results than all of the other ways? It seems pointless. At the very least, perhaps there should be a section in the documentation that talks about how passing records (and objects) actually works regarding optimization with the different keywords, just to make sure that people are aware?
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