Inconsistent behavior of list property in QML

import QtQuick 2

Item {
    Item { id: item1 }
    Item { id: item2 }

    property list<Item> list2: [
        item1,
        item2, // OK, trailing comma is allowed
    ]

    property list<Item> list1: [
        Item {},
        Item {}, // Error: trailing comma is not allowed here
    ]

    property list<Item> list3: [
        Item {},
        item1 // Error: mixing id and item declaration is not allowed
    ]
}