Interfaces are not functional, but inherently OO in the sense that there is always an object involved to which you send a message (= call member of the interface). So interfaces are contracts for objects (or values, but this does not help) and not for types. #fsharp
Programmers used to interfaces and not used to type classes rarely think of this example: wouldn’t it be natural and useful to have “empty collection” as part of, say, ICollection<‘t>? That would be a contract for type t itself as opposed to values of t. #fsharp
So static interface members are actually a very exciting feature which makes interfaces more functional and strictly more expressive and therefore useful. #fsharp
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