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, 2 insertions, 2 deletions

diff --git a/src/universe.hpp b/src/universe.hpp
index d35172d..75604d8 100644
--- a/src/universe.hpp
+++ b/src/universe.hpp
@@ -16,7 +16,7 @@ class Linda;
 // #################################################################################################
 
 // mutex-protected allocator for use with Lua states that share a non-threadsafe allocator
-class ProtectedAllocator
+class ProtectedAllocator final
 : public lanes::AllocatorDefinition
 {
     private:
@@ -67,7 +67,7 @@ static constexpr RegistryUniqueKey kUniverseLightRegKey{ 0x48BBE9CEAB0BA04Full }
 
 // everything regarding the Lanes universe is stored in that global structure
 // held as a full userdata in the master Lua state that required it for the first time
-class Universe
+class Universe final
 {
     public:
     static constexpr char const* kFinally{ "finally" }; // update lanes.lua if the name changes!