code: private final void expeditedInsert(T t) {
          expeditedBuffer[expeditedPutIndex] = t;
  
          if (++expeditedPutIndex >= expeditedBuffer.length) {
              expeditedPutIndex = 0;
          }
      }
docs: Inserts an object into the expeditedBuffer. Note that
  since there is no synchronization, it is assumed
  that this is done outside the scope of this call.