message: fix: add output operation for InletVector
diff: @@ -62,6 +62,12 @@ inline bool operator==(const InletVector& u, const InletVector& v)
  return (u.vec == v.vec) && (u.dim == v.dim);
  }
  +inline std::ostream& operator<<(std::ostream& os, const InletVector& v)
  +{
  + os << v.vec;
  + return os;
  +}
  +
  } // namespace detail
  /*!
  