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Num.neg docs

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See also https://github.com/roc-lang/roc/issues/6959

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crates/compiler/builtins/roc/Num.roc
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@ -708,6 +708,8 @@ absDiff = \a, b ->
##
## Num.neg 0.0
## ```
## !! Num.neg is not completely implemented for all types in all contexts, see github.com/roc-lang/roc/issues/6959
##
## This is safe to use with any [Frac], but it can cause overflow when used with certain [Int] values.
##
## For example, calling #Num.neg on the lowest value of a signed integer (such as [Num.minI64] or [Num.minI32]) will cause overflow.