Make Type implement IEquatable<Type>

[TylerBrinkley]

I'm not sure why this hasn't been done as Type already has an Equals(Type) method but I'd like Type to implement IEquatable<Type> so I can use Type as a type argument where there's a generic type constraint of IEquatable<T> such as in DictionarySlim.

[terrajobst]

Video

What about other types in the MemberInfo hierarchy?

@steveharter what are you thoughts?

[TylerBrinkley]

Just from a cursory look at the other derived types of MemberInfo, e.g. EventInfo, FieldInfo, MethodInfo, ConstructorInfo, and PropertyInfo, none of those include an equivalent Equals(T) method just an override of Equals(object).

Is the concern that we might want to make MemberInfo implement IEquatable<MemberInfo>? Would that cause issues if we also made Type implement IEquatable<Type>? If so I think we should prefer implementing the interface on Type as it's abundantly more common and the only derived type of MemberInfo that resides in the System namespace and as such should get preferential treatment.