First argument in Array.indexOf

[ZenVoich]

I needed to find the index of an element in array and for my case the first argument seems redundant.

Array.indexOf<Nat>(Int.abs(Time.now()), halvings, func(halving, now) { // I have to double check in base source code which arg is which
    now < halving
})

Maybe add a new function Array.findIndex similar to Array.find?

func findIndex<T>(array : [T], predicate : T -> Bool) : ?Nat;

Usage

Array.findIndex<Nat>(halvings, func(halving) {
    Time.now() < halving
})