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the thing is that validate is a function which receives those 4 parameters, and not a Tuple4, so reference function will not match

There's a helper somewhere to convert between them, IIRC

is this in Arrow? I suppose it would be something like:
```    fun &lt;A, B, C, D, E&gt; ((A, B, C, D) -&gt; E).tupled() = { params: Tuple4&lt;A, B, C, D&gt; -&gt;
        this(params.a, params.b, params.c, params.d)
    }```
implemented by myself just for fun :joy:

it may be in arrow syntax, but you solved it properly :smile:

<https://github.com/arrow-kt/arrow/blob/master/modules/core/arrow-syntax/src/main/kotlin/arrow/syntax/function/pairing.kt>

if you could PR a couple more arities, it'd be great :smile:

in this case, the need is the conversion between functions and TupleN, not Kotlin´s Pair/Triple, would you find useful to make a PR with this? I could work on it :slightly_smiling_face:

Yeah we ignorem kotlin’s for now. A PR would b great!