collection.Base: isItem() has to return true for "object like" items

    isItem(value) {
        return Neo.isObject(value) || Neo.isRecord(value)
    }

the change happened, when introducing Neo.isRecord() and making Neo.isObject() super strict to only return true for real objects.

collections however can contain neo instances as items, which no longer get recognised.

if the recognition no longer works, removing items will break, which can result in growing memory leaks when frequently removing items.