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This PR introduces
Int.toNat()
,Int.fromNat()
,Nat.toInt()
, andNat.fromInt()
to convert between integers and natural numbers. Because this is such a common use case, I think these conversions are worth including in both modules for convenience.In addition, I added
Int.fromText()
which works in the same way asNat.fromText()
with an optional+
or-
symbol at the beginning of the input text.Progress for #95.