The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1, NuGet/setup-nuget@v1.0.5, actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Cannot convert null literal to non-nullable reference type.

Dereference of a possibly null reference.

Non-nullable property 'Root' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Possible null reference return.

Argument of type 'Func<TreeNode<T>, bool>' cannot be used for parameter 'predicate' of type 'Func<TreeNode<T>?, bool>' in 'TreeNode<T>? Enumerable.FirstOrDefault<TreeNode<T>?>(IEnumerable<TreeNode<T>?> source, Func<TreeNode<T>?, bool> predicate, TreeNode<T>? defaultValue)' due to differences in the nullability of reference types.

Possible null reference return.

Possible null reference return.

Possible null reference argument for parameter 'type' in 'bool ObjectExtensions.IsPrimitive(Type type)'.

Converting null literal or possible null value to non-nullable type.