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

Argument of type 'Dictionary<object, object>' cannot be used for parameter 'm' of type 'IDictionary<object, object?>' in 'GraphTraversal<string, Edge> GraphTraversal<string, string>.MergeE(IDictionary<object, object?>? m)' due to differences in the nullability of reference types.

Argument of type 'Dictionary<object, object>' cannot be used for parameter 'm' of type 'IDictionary<object, object?>' in 'GraphTraversal<Edge, Edge> GraphTraversalSource.MergeE(IDictionary<object, object?>? m)' due to differences in the nullability of reference types.

Cannot convert null literal to non-nullable reference type.

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

Non-nullable property 'DictifiedLast' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.