Such a design creates numerous superfluous temporaries. Even with short-string optimizations, eventually the composition of such temporaries creates temporaries whose length exceeds that of of the short-string space. This starts to put undue pressure on the allocator.

In C++ the right equivalent to `toString()` for output composition is the `std::ostream &operator << ( std::ostream &, const T & )` overload which is ADL-found at use. If temporary strings are needed, `std::stringstream` can be used. Additionally, `str::stream()` exists in our code base.