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/intercopycontext.cpp b/src/intercopycontext.cpp
index fd6b5a5..6b3d282 100644
--- a/src/intercopycontext.cpp
+++ b/src/intercopycontext.cpp
@@ -1279,7 +1279,7 @@ InterCopyResult InterCopyContext::interCopyPackage() const
 {
     DEBUGSPEW_CODE(DebugSpew(U) << "InterCopyContext::interCopyPackage()" << std::endl);
 
-    class OnExit
+    class OnExit final
     {
         private:
         lua_State* const L2;