About GLPK.exact it is not possible to get the rational number 3/28 instead
> of a decimal approximation ?
>

No, unfortunately. Also, for that to happen/make sense, you'd also need to
be able to pass all the *inputs* as exact rational values, i.e. as "1//7"
instead of "1/7". This would be possible if we had a native generic Julia
linear programming solver, but it's not possible with GLPK, which can only
use exact arithmetic internally.

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