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++ stderr_tracer doesn't trace statement preparation [2.4.0]
+
+ If a statement is invalid, then it will fail during preparation. However,
+ currently, there is no way to see that statement since stderr_tracer doesn't
+ trace this event.
+
+ Options:
+
+ * trace preparation by default - too much info
+ * allow changing behavior at runtime - not thread safe
+ * support via bool flag and make user instantiate - burdensome
+ * support via bool flag and instantiate stderr_full_tracer - code bloat
+ but seems the best option
+
++ C++11 support is not trully header only [c++11]
+
+ Added a new class details::function_wrapper<F>, which can be used similarly
+ to std::function<F>. In particular, C++11 code can construct a
+ function_wrapper from a lambda, or a std::function, or another
+ function_wrapper. But it differs from std::function in this respect:
+ C++98 code can declare and define function_wrapper objects.
+
+ Now all builds (98 or 11) of libodb keep their callbacks in
+ function_wrappers. C++11 user code can register std::functions or lambdas as
+ callbacks, and the glue that turns those into function_wrappers for libodb is
+ header-only.
+
+ This technique is currently used for data migrations and query factories.