code: @SuppressWarnings("unchecked")
      public final V get() {
          InternalThreadLocalMap threadLocalMap = InternalThreadLocalMap.get();
          Object v = threadLocalMap.indexedVariable(index);
          if (v != InternalThreadLocalMap.UNSET) {
              return (V) v;
          }
  
          return initialize(threadLocalMap);
      }
docs: Returns the current value for the current thread