Citing the golang wiki (https://github.com/golang/go/wiki/MethodSets#interfaces):
"The concrete value stored in an interface is not addressable, in the same way, that a map element is not addressable."
The question of map values not being addressable is explained here: Why are map values not addressable?
However, it is not clear regarding the interface. Why are they not addressable? Is this because of some hard design assumption?
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