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* Ensure the BufferMapAsyncCallback is always called. This solves two issues on the Gecko side: - The callback cleans up after itself (the user data is deleted at the end of the callback), so dropping the callback without calling it is a memory leak. I can't think of a better way to implement this on the C++ side since there can be any number of callback at any time living for an unspecified amount of time. - This makes it easier to implement the error reporting of the WebGPU spec. * Update the changelog.