docs: public @Nullable InputStream getInputStream() {
      if (mInputStreamSupplier != null) {
        return mInputStreamSupplier.get();
      }
      CloseableReference<PooledByteBuffer> pooledByteBufferRef =
          CloseableReference.cloneOrNull(mPooledByteBufferRef);
      if (pooledByteBufferRef != null) {
        try {
          return new PooledByteBufferInputStream(pooledByteBufferRef.get());
        } finally {
          CloseableReference.closeSafely(pooledByteBufferRef);
        }
      }
      return null;
    }