> No change
> Benefit: No change to the language.
> Drawback: Must use “fileprivate” to build up a type through extensions.
> 
> SE–0159
> Benefit: Simplifies the access control model.
> Drawback: Cannot protect invariants within a file.
> 
> SE–0169
> Benefit: Cross-type sharing is clearly marked.
> Drawback: Must use a helper type to protect invariants within a file.
> 
> Rename
> Benefit: No change to semantics.
> Drawback: Two separate keywords are changed.


As the dedicated thread was highjacked ;-), imho it's just fair to add another 
option here...

Nested extensions
Benefit: Expressive power, no breaking change (and more…)
Drawback: More indentation

The table is quite boring:
Nested Extensions
Simple file     private
Extensions      private
Sharing private
Helper visible  private
Helper hidden   private
Invariants      private
Multi-type      private
Multi-type + ext        private

I'm not sure about the colour, but if I wasn't to lazy to edit raw HTML, imho 
there would a lot of green ;-)
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