This is a generic smart pointer. It had to be designed and verified manually, but that line of code has been written once 8 years ago, and nobody had to remembe

This is a generic smart pointer. It had to be designed and verified manually, but that line of code has been written once 8 years ago, and nobody had to remember to write this FFI glue or even call this method since. It makes the public API automatically safe for all uses of all weak refs of all GTK types. The Zig version seems to be a fix for one crash in a destructor of a particular window type. It doesn't look like a systemic solution preventing weak refs crashes in general.