I need a function, which accepts an arbitrary tuple type and returns the
types of the components of the tuple. For example
```
f(Tuple{Int64, Float64}) --> (Int64, Float64)
f(Tuple{Int64, MyType, Float32}) --> (Int64, MyType, Float32)
f(NTuple{3}) --> (Any, Any, Any)
f(Tuple) --> Some error since
length is unknown
```How to accomplish this?
