Say message A has "repeated B b = ...", we have to do

    *a.add_b() = another_b_instance;
or the deprecated
    *a.add_b()->CopyFrom(another_b_instance);

Why not just let us do something like:

    a.add_b(another_b_instance);

And not just C++, this seems to be the paradigm in other language as well. 
 I am curious about the design consideration.  Thanks!

-Xiaofeng

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