use BigInt instead of Int

[gbagan]

This ia PR following the advice of @hdgarrood #33

The changes are:

• Rational is now a newtype over Ratio BigInt.
• Add a dependency on bigints and remove the dependency on integers
• numerator and denominator now return BigInts
• % is polymorphic. It accepts Int -> Int -> Rational or BigInt -> BigInt > Rational. This minimizes breaks.
• Update the tests

The readme needs to be updated.

[f-f]

I have tested this and it works, so I think it's good to merge

[f-f]

The only things to do I think should be:

• resolving conflicts
• noting somewhere (maybe add a package.json?) that this requires installing the big-integers JS package

[sigma-andex]

I think it would be better to make this depend on js-bigints, which doesn't require a npm dependency.

[gbagan]

I think the same thing now that bigints are widely adopted by browsers.
js-bigints does not require a npm dependency, is faster and easier to maintain.
Maybe we should wait for js-bigints to be transferred to purescript-contrib.

[sigma-andex]

Maybe we should wait for js-bigints to be transferred to purescript-contrib.

Done! https://github.com/purescript-contrib/purescript-js-bigints

[f-f]

Any news on this?
@gbagan I could help with moving forward this branch if needed

[gbagan]

Hi,

Sorry for the delay.
Actually, I just need a new realease of js-bigints (which contains the last PR with toInt and toNumber).

[f-f]

New release is out! (thanks @sigma-andex)

[gbagan]

Since js-bigints 2.1 is now present in the last package-set, I have replaced bigints with js-bigints as object behind Rational

[gbagan]

@f-f or someone else,
could you help me to resolve the conflicts, please?
I don't know what to do

[gbagan]

I have created a branch gbagan-master that resolve conflicts.
Do I need to make a new PR with this branch?

[f-f]

You could merge the new branch in here, but making a new PR is just easier! I can review that right away

[f-f]

Closing in favour of #42