How can I remove value "2"?

In Groovy, you can remove an object from a list by using remove(int index) or remove(object obj). But if I have a list of ints, how can I remove an object by "value" rather than the index?

    def list = [2, 1, 3]

    list.remove(2)
    assert list == [1, 3] // throws AssertionError, 'cause list = [2, 1]