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- SDL_RWops is now an opaque struct. - SDL_AllocRW is gone. If an app is creating a custom RWops, they pass the function pointers to SDL_CreateRW(), which are stored internally. - SDL_RWclose is gone, there is only SDL_DestroyRW(), which calls the implementation's `->close` method before freeing other things. - There is only one path to create and use RWops now, so we don't have to worry about whether `->close` will call SDL_DestroyRW, or if this will risk any Properties not being released, etc. - SDL_RWFrom* still works as expected, for getting a RWops without having to supply your own implementation. Objects from these functions are also destroyed with SDL_DestroyRW. - Lots of other cleanup and SDL3ization of the library code.