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duplicates macro arguments before expansion
As discussed with Jason, this is an important dimension of defenses that we can build to ensure robustness of the macro engine. This commit is important in the context of the upcoming patch to the presentation compiler that will throw away expansions and keep original macro applications (only when run in presentation compiler mode) so that hyperlinking in macro arguments starts working in the IDE. Duplication of macro arguments will make sure that macro arguments, which are going to become exposed to the IDE, can’t become corrupted by possibly misbehaving or misguided macros.
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