[boost] Namespace policy: putting names in boost::detail

A GSoC student and I are currently converting a library to use the namespace boost::simd. Some of the implementation details of the library are not simd-specific, and we would like to use them in some other libraries that extend boost::simd. Would it be ok to put them in the boost::detail namespace, or is that considered as bad as putting stuff in the boost namespace? We need to inject overloads and specializations into a unique namespace for boost.simd and NT2, so we could need two names, like boost::detail::dispatch and boost::detail::specialize.