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f8e7c3d476
The why of this mutex is in `Library` is a bit complex. It has been introduced inc2927cewhen there was only `Library` and no `std::unique_ptr<Impl>`. As introducing the mutex imply implementing the move constructor, we have split all data in `LibraryBase` (and keep a default move constructor here) and add the mutex in `Library` (and implement a simple move constructor). Later, in090c2fd, we have move the `LibraryBase` to `Library::Impl` (which should have been `Library::Data`). So at the end, `Library::Impl` is never moved. We can move the `mutex` in it and still simply implement move constructor for `Library`.