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a54d028895
This reverts commit 276ca873. That commit has quite a history at this point. It was first landed in dbc647643577, which broke std::shared_ptr<T const> and was reverted in 9138666f5. It was then re-applied in 276ca873, with the std::shared_ptr issue fixed, but it caused widespread breakage at Google (which suggests it would cause similar breakage in the wild too), so now I'm reverting again. Instead, I will add a escape hatch that vendors can turn on to enable the extension and perform a phased transition over one or two releases like we sometimes do when things become non-trivial.