[Question] Serialization result of `DBNull.Value` should be empty object(`{}`)?

[filzrev]

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Currently, DBNull.Value is serialized to empty object string({}).

There is dedicated code path for DBNull.Value on FullObjectGraphTraversalStrategy. But it seems not be used. (Because value.IsDbNull() always returns false, And ther is no break statement)

https://github.com/aaubry/YamlDotNet/blob/7bed5cf0750c7ca58ba69ad8c07f6eb136080540/YamlDotNet/Serialization/ObjectGraphTraversalStrategies/FullObjectGraphTraversalStrategy.cs#L141-L144

Is this current behavior is working as expected?

[!NOTE] Returning empty object is same behavior as System.Text,Json. (https://github.com/dotnet/runtime/issues/418)