Did you try out https://package.elm-lang.org/packages/cmditch/elm-bigint/latest/ https://package.elm-lang.org/packages/cmditch/elm-bigint/lat...? I've used that

Did you try out https://package.elm-lang.org/packages/cmditch/elm-bigint/latest/ https://package.elm-lang.org/packages/cmditch/elm-bigint/lat...? I've used that for things that I know exceed the browsers limits with JS numbers. Had to use it recently with something that returned a JS BigInt (which was a whole other buggy problem).