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Not sure if this is an error in documentation or purposeful omission, or perhaps a bug in fsharp.
Here max
is described as
Maximum based on generic comparison
And here compare
is described as
Generic comparison.
However, even though they kind of boil down to the same thing in implementation for most types, they do not specifically for floating point numbers. Moreover, if one defines a max function with compare
, for example like this:
let max2 x y = if compare x y < 0 then y else x
Then max2
behaves differently than max
with respect to NaN, e.g.:
> max2 1. nan;;
val it: float = 1.0
> max2 nan 1.;;
val it: float = 1.0
whereas
> max nan 1.;;
val it: float = nan
> max 1. nan;;
val it: float = nan
If this discrepancy in behavior is expected, then perhaps it should be documented?
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