When using mods that alter % of quality 100% doesn't mean 100% next quality,
Can you add an option to allow quality in the modules slots and accept quality from beacon if they can have quality ?
Or
Can you make it that it transform an item to the next quality 100% chances but it take like 2x the fluid if the chance to get next quality is 50% (3x -> 33% etc) ?
https://i.imgur.com/wEoNyh8.png

Hey, sorry for the super late reply.

Technically even in base game the claimed 100% doesn't mean always uncommon from normal. There's still 10% for rare, 1% for epic, 0.1% for legendary to appear when you roll it, so you actually go normal->uncommon only 88.9% of the time. What Refinery is meant to do is upcycle an already crafted item at no resource loss.

So mod description is inaccurate, it should say

It has a base quality effect of +100%. Out of the box, it directly upgrades an item to at least the next quality level, with no resource loss.

which I didn't think to change when it was mentioned earlier. And because of how chances on quality work and what we have available for modding, there's no (easy) way to guarantee that a roll in the Refinery will always be of exactly next quality. Even a mod like No More Gambling can't and it's the closest you can get to it.

I didn't like the idea of allowing quality module effect on it, but I'll make it a mod option if changes in your modlist happen to need it

Yes if you could add that option to enable quality module in it that would be cool, because if you want 100% of legendary->mythic in my modpack you need 1000% quality and you can get it with modules and specialized beacons.

It was added in 0.8.17. It needs Factorio 2.0.35 which is in experimental, you'll need to opt-in to experimental updates for the time being