As you can see on the demo patch, AverageHash outputs an Int64. With the test images provided in the repo, the number seems to be too big and the IOBox displays 0. But if you hover it, it will display the correct value :
If I use a different image that creates a smaller hash, the value is correctly displayed. But if re-use the image that was resulting in a “too big” hash, the IOBox keeps the previous value but still give the correct one on hover :
Thanks in advance !