https://drafts.csswg.org/css-grid-1/#grid-item-sizing
There is a note which says "Note: This can distort the aspect ratio of the item, if it has one."
This implies that if there is 'stretch' in one dimension, it should distort the image. This note should probably say something along the lines of "Note: This can distort the aspect ratio of the item, if it has stretch in both axes." or something.
Testcase: https://www.software.hixie.ch/utilities/js/live-dom-viewer/?saved=8675
https://drafts.csswg.org/css-grid-1/#grid-item-sizing
There is a note which says "Note: This can distort the aspect ratio of the item, if it has one."
This implies that if there is 'stretch' in one dimension, it should distort the image. This note should probably say something along the lines of "Note: This can distort the aspect ratio of the item, if it has stretch in both axes." or something.
Testcase: https://www.software.hixie.ch/utilities/js/live-dom-viewer/?saved=8675