Smush weird size specifications 1200×9999 1980×9999 600×0 768×0
I am looking at the sizes/resolutions WP Smush (v3.4.2) uses to scale images.
Some of them don’t make much sense as they stand.
Image Sizes/Custom in Smush settings menu, but also on things like product pages:
768x0 600x0 1980x9999 1200x9999
I suspect they could be something to do with aspect ratio (e.g leave Y-dimension as is, or scale Y such that X = 600)
Can someone educate me on this?