map.reclaimValue(valueReference);
        if (++i == DRAIN_MAX) {
          break;
        }
      }
    }

    <T> void clearReferenceQueue(ReferenceQueue<T> referenceQueue) {
      while (referenceQueue.poll() != null) {}
    }

    /** Returns first entry of bin for given hash. */
    @Nullable E getFirst(int hash) {