Hi Steven, I'm interested in your TypeErasure library. Where can I find the on going version? The example for concept map seams not complete, as the specialization for less_than_comparable<std::type_info> is not used in any type erasure type. Could you complete it? Before the Boost.Conversion review someone signaled that the Boost.Conversion review was promoting ODR violations as two libraries could specialize a conversion for types S and T and make them incompatible for an end user as the ODR is violated. I think that your library suffer from the same issue, when two libraries need to specialize a concept provided by the library for a 3rd part concrete class using the proposed concept map mechanism. Do you agree? If not, how do the library avoids this kind of issue? Best, Vicente