message: meshable_arena: don't debug assert if we have an invalid ptr
diff: @@ -83,11 +83,11 @@ public:
  inline void *ATTRIBUTE_ALWAYS_INLINE miniheapForArenaOffset(Offset arenaOff) const {
  const MiniHeapID mhOff = _mhIndex[arenaOff].load(std::memory_order_acquire);
  - d_assert(mhOff.hasValue());
  - const auto result = _mhAllocator.ptrFromOffset(mhOff.value());
  - // debug("lookup ok for (%zu) %zu %p\n", arenaOff, mhOff, result);
  + if (likely(mhOff.hasValue())) {
  + return _mhAllocator.ptrFromOffset(mhOff.value());
  + }
  - return result;
  + return nullptr;
  }
  inline void *ATTRIBUTE_ALWAYS_INLINE lookupMiniheap(const void *ptr) const {
  