[BUG?] images.get_serving_url serving service doesn't resize images upwards at production

[Kaan Soral]

I was always under the impression that images were scaled upwards up to =s1600, I don't remember whether I ever verified it on the production, yet on the SDK it scales the images upwards

For example an 200x100 image becomes 1600x800 with =s1600 - which is great

On the other hand, =s1600-c converts an 200x100 image to become 800x800 (which is just stupid, yet predictable at least)

If =s1600-c works, =s1600 should too

Any ideas?

Were things always like this, or is this a recent change?

I guess I will modify things to manually scale images, but I really hate doing that, as manual calculations are usually off by 1px compared to the images serving calculations, blurs images

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https://cloud.google.com/appengine/docs/python/images/functions

states the images service works up to 1600, therefore it seems very logical to demand this functionality/behaviour from google, is it covered by the SLA?