docs: public boolean isInBitmapMemoryCache(final ImageRequest imageRequest) {
      if (imageRequest == null) {
        return false;
      }
      final CacheKey cacheKey = mCacheKeyFactory.getBitmapCacheKey(imageRequest, null);
      CloseableReference<CloseableImage> ref = mBitmapMemoryCache.get(cacheKey);
      try {
        return CloseableReference.isValid(ref);
      } finally {
        CloseableReference.closeSafely(ref);
      }
    }