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## Close #3509 <!-- Add the relevant issue number after the "#" mentioned above (for ex: Fixes #1234) which will automatically close the issue once the PR is merged. --> <!-- Add a brief overview here of the feature/bug & fix. --> ## PR Type What kind of change does this PR introduce? <!-- Please uncomment one or more that apply to this PR. --> - Refactoring (no functional changes, no api changes) <!-- - Build or CI related changes --> <!-- - Documentation content changes --> <!-- - Sample app changes --> <!-- - Other... Please describe: --> ## What is the current behavior? <!-- Please describe the current behavior that you are modifying, or link to a relevant issue. --> There are a number of usages of `Unsafe.AsRef<T>(null)` and similar that are verbose. ## What is the new behavior? <!-- Describe how was this issue resolved or changed? --> These occurrences are replaced using the new `Unsafe.NullRef<T>()` and `Unsafe.IsNullRef<T>(...)` APIs. ## Notes Leaving this as draft as the new `System.Runtime.CompilerServices.Unsafe` package is still in release candidate. ## PR Checklist Please check if your PR fulfills the following requirements: - [X] Tested code with current [supported SDKs](../readme.md#supported) - [ ] ~~Pull Request has been submitted to the documentation repository [instructions](..\contributing.md#docs). Link: <!-- docs PR link -->~~ - [ ] ~~Sample in sample app has been added / updated (for bug fixes / features)~~ - [ ] ~~Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets)~~ - [X] Tests for the changes have been added (for bug fixes / features) (if applicable) - [X] Header has been added to all new source files (run *build/UpdateHeaders.bat*) - [X] Contains **NO** breaking changes