Example 1 - Methods:
http://play.golang.org/p/hfRkC6nKag
Example 2 - Interfaces:
http://play.golang.org/p/F1UyKlTh3k
Example 3 - Extending Types:
http://play.golang.org/p/JJ811lBwoz
Example 4 - Overriding Inner Types:
http://play.golang.org/p/-xQFBv9_82
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