On: Don't return null; use a tail call

[arethuza]

It was just a question about the syntax used - why type Nullable<int> when there is direct syntactical support in C# for nullable types - in this case you could simply type int? rather than Nullable<int>

[endianswap → arethuza]

At the very least Nullable<T> is a lot friendlier to search than T? if you want to learn more on the subject.

[bfung → arethuza]

not everyone is familiar with C#, and Nullable<int> conveys better meaning in writing to that kind of audience.