I'm not entirely sure what this PR is about - @Siemienik do you know? @Alanscut could you elaborate a little bit and maybe provide a test case?

ok, I will add some test for it later.
when you add an image to a worksheet, property editAs will control how the image is anchored to the cell(s). it could be undefined, oneCell or absolute. But when you set it to absolute, the value of editAs in generated excel file will still be oneCell.
https://github.com/exceljs/exceljs/blob/master/README.md#add-image-over-a-range

there is another problem. The README says undefined is the default value of property editAs, however, the actual situation is that oneCell is the default value. In fact, when creating a Excel file and inserting an image to it, the default property of editAs is oneCell too. So should I change the readme file?

AD. undefined in documentation - I think, we should update readme, and all will be ok.

@Alanscut yeah let's update the README and then we're good to go