For the standard sequences, why does resize take type T by value whereas all
other functions that take type T take T by reference to constant?  e.g. from
23.2.4,2:

class vector
{
    explicit vector(size_type n, const T& value = T()), const Allocator& =
Allocator());
    void push_back(const T& x);
    void resize(size_type sz, T c = T());
};
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