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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The translator is @donaldsebleung. I don't know PureScript so I can't help. The two existing solutions don't use BigInt or BigRational.
I get the same issue as you described. Even when using BigInt for intermediate calculations, the problem persists.
Not done in PureScript but I suppose it is doable within the Int range.