src/precore/util/Iterables.php
public static function toString(IteratorAggregate $iterable) : string
    {
        return Iterators::toString(Iterators::from($iterable->getIterator()));
    }
public static function toString(IteratorAggregate $iterable) : string
    {
        return Iterators::toString(Iterators::from($iterable->getIterator()));
    }
Returns a string representation of iterable, with the format [e1, e2, ..., en].

@param IteratorAggregate $iterable
@return string