>>Well, actually your interface does exist (if my object exposes the same set
of methods as an instance of String, then it is a String), 

This is what i am referring ,duck typing.

>>The concept of an interface exists in all OO languages I've used, even when
there was no keyword 'interface'.

In my question , i meant 'Interface' as a keyword and functionality  as in java 
and c# (statically typed languages).
I think, the concept of interfaces exists in all languages ,for example in c 
you expose your  functions in header files,i think it is also a kind of 
interface.

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