Too much equality?

[sliekens]

Many entity classes implement interfaces like IEquatable and IComparable, but their implementation is questionable. What makes two API results equal? Is it their object ID in the API? Is it their localized name?

As a user, I would expect that reference equality is the only absolute indicator. Every other form of comparison would be implementation-specific (custom grouping and sorting etc.), and does not belong in the core library, but rather in a custom class that implements IComparer<TEntity>.

Should the current implementations be left as-is, changed or removed entirely?

https://msdn.microsoft.com/en-us/library/vstudio/7h9bszxx(v=vs.110).aspx
http://www.informit.com/articles/article.aspx?p=2425867