PathBase<T>.Up(1) has bug?

It looks like there is small bug or feature in this method.
When the path is directory ends with '\' character then .Up(1) just remove this character.
And I think that the purpose of this method is to do the same what "../" does in CMD.

```csharp
var example1 = Fluent.IO.Path.Get("C:\\aaa\\bbb\\").Up(1).FullPath;
var example2 = Fluent.IO.Path.Get("C:\\aaa\\bbb").Up(1).FullPath;
Debug.Assert(example1 == example2);
```
In my opinion:
"C:\\aaa\\bbb\\" and "C:\\aaa\\bbb" are not the same string
but are the same path.