Minor internal code tweaks

* mark all eligible classes Final
* new TableIndex strong type
* buildfixes for HAVE_DEBUGSPEW()
* overridden virtual destructors tagged as such

1 files changed, 1 insertions, 1 deletions

diff --git a/src/macros_and_utils.hpp b/src/macros_and_utils.hpp
index 26d47a9..16011f7 100644
--- a/src/macros_and_utils.hpp
+++ b/src/macros_and_utils.hpp
@@ -53,7 +53,7 @@ typename T::value_type const& OptionalValue(T const& x_, Ts... args_)
 struct PasskeyToken {};
 constexpr PasskeyToken PK{};
 template <typename T>
-class Passkey
+class Passkey final
 {
     private:
     friend T;