> The problem is that if you have multiple optional or named
> parameters, things start getting uncomfortably prolix, and default
> values end up a long way from their owners:
>
> multi substr(Str $str, $from is optional = $CALLER::_,
> $len is optional = Inf, $new is optional) {...}
>
> vs:
>
> multi substr(Str $str, ?$from = $CALLER::_, ?$len = Inf, ?$new)
> {...}
What kind of wrench-in-the-works would this cause?
multi substr(Str $str, ($from = $CALLER::_) is optional,
($len = Inf) is optional, $new is optional) {...}
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