Pointer-or-Int 63-bit representations for Integer

[Chris Done]

Hi all,

I did a trivial test, in case anybody's interested, in the unboxed sum idea approach, only considering the Int# branch.

https://gist.github.com/chrisdone/6aef640a49fc30b45ad210eac287dce9

It seems to be on par with Int, which is pretty cool because I wasn't sure what to expect. Assuming I didn't make a horrible mistake.

`B = 272.2 μs`
`Int = 270.9 μs  `
`Integer = 7.860 ms `

Cheers,

Chris
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