faisalv added a comment. Seems reasonable to me if we have the bit to spare. I wasn't a huge fan of the sentinel approach - but i appreciated Richard showing me that trick. I don't think I realized that Decl has to be aligned on an 8 byte boundary. I'm not too familiar with the alignment gymnastics - but I'm assuming you've given some thought to any existing pathological code that might break if the actual compile-time alignment of Decl itself is changed (since currently it seems to be that the alignment requirements are established at run-time and only through allocation via new (not that anyone would be creating Decls on the stack)) - and whether there are any consequences of relevance there... Thanks!
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