S3ObjectVersion IsDeleteMarker and IsLatest changed to nullable?

[Coder3333]

The S3ObjectVersion.IsDeleteMarker and IsLatest properties were changed from bool to bool? with v4. How should I interpret a null value? Does this mean true or false? Will it just never be null? Anybody know why this changed?

[dscpinheiro]

This change was intentional (https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html#net-dg-v4-value-types) and the preview 1 blog post has more details on why this change was made and what a null response means:

V4 changes properties on classes used for requests and responses that used value types like int, bool, and DateTime to use the nullable version, essentially changing the type from bool to bool?. This addresses a long standing issue many users had with the SDK in that they could not tell, for example, if a boolean property is false because the service returned false, or if the property is false because that is the default value for bool types.

Because .NET’s handles implicit conversation between value types and nullable value types, many applications will require no changes other then recompilation. In cases, where the implicit conversation doesn’t handle the change, the .NET compiler will return a compilation error. You will need to update your code to call the Value property or the GetValueOrDefault method.