Load huge image

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I try to load relativity big image 32000x32000, 1 channel but assertions raised:

Error: Assertion failed (pixels <=> (1<<30)) in> cv::validateInputImageSize, file C:\Lib\opencv\source\opencv\modules\imgcodecs\src\loadsave.cpp, line 74

OpenCV(4.0.0-pre) Error: Assertion failed ((size_t)valueInt == sz) in validateToInt, file C:\Lib\opencv\source\opencv\modules\imgcodecs\src\utils.cpp, line 48

imread_('e:/0/33333b.bmp'): can't read data: OpenCV(4.0.0-pre) C:\Lib\opencv\source\opencv\modules\imgcodecs\src\utils.cpp:48:  error: (-215:Assertion failed) (size_t)valueInt == sz in function 'validateToInt'

However we can:

Mat m(65000, 40000, CV_8U);

 uint64 i, n = (uint64)m.rows*m.cols;
 for( i = 0; i < n; i++ )
     m.data[i] = (uchar)(i & 255);

cv::threshold(m, m, 127, 255, cv::THRESH_BINARY);
imwrite("e:/0/ttt.jpg", m);

and it works fine. This means we cant load image bigger 1 Gigapixel (UPD. by imread), but able to process and save it?