Cookies

@s-panferov I think this handles everything.

cc @reem 
+1 for `cookies_raw[]`:

1. Slicing syntax does here what it designed for.
2. It is much cleaner and homogeneously for eyes.
3. It is a known syntax for peoples from Python, Ruby and so on.
4. If later you will want to take another slice, (e.g. `slice_from(1)`), you will have to use slicing syntax anyway.