Thank you Michael for that. I have written a small package to help with
this kind of uncertainty :)

https://play.golang.org/p/vSnG-HGdrU

On Mon, 2016-11-07 at 16:08 -0800, Michael Jones wrote:
> Not precisely so…Interfaces, and type switches, and related
> mechanisms are safe. Their type indeterminism is protected from the
> program and their concretization is much like Schrodinger’s box…the
> interface is any type until you look at it through a type switch or
> type dereferencing…then it is a living concrete type of an expected
> type or else, like the cat, your program is dead. 



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