This reverts commit 09248a5d25bb1c9f357247fa3da8fbe4470e9c67. Some builds are broken. I suspect a `static constexpr` in a class missing a definition out of class (required pre-c++17).
This reverts commit 09248a5d25bb1c9f357247fa3da8fbe4470e9c67. Some builds are broken. I suspect a `static constexpr` in a class missing a definition out of class (required pre-c++17).