I'm not a big Atlassian hater, but the other day I spent 7 hours trying to fix an account migration error. Two users had access rights and all, but couldn't see any repository. I ended up deleting them and adding other accounts. It was ... odd. Oh, and there's that thing of joining an empty workspace. And that other thing. Yes, there's quite a bit wrong under the hood. Feels like teams working on small features that don't work well together (either the teams or the implementation).
Is that the case? I was under the impression that Decimals were used in financial contexts because (besides preventing floating point error) you can define how to handle things such as rounding behavior.
For instance, at least in Python, 3//2 == 1 while -3//2 == -2; integer division is rounded down, and not towards zero as one may expect. Decimal lets you pick how you want that to go.
Generally decicents (10 decicents = 1 cent) makes all normal currency calculations much easier/reliable. If you need lower resolution use millicents or microcents