protected T getOrCreateNew(int dimID, @Nonnull ChunkPos coords) {
            val pair = Pair.of(dimID, coords);
            T t = data.get(pair);
            if (t == null) {
                try {
                    t = clazz.newInstance();
                } catch (Exception e) {
                    Chisel.logger.error("Could not instantiate NBTSaveable " + clazz.getName() + "!");
                    Throwables.propagate(e);
                }
            }
            data.put(pair, t);
            return t;
        }