According to Mr. Haki, Groovy 4 supports excluding the first value from a range construction. However, when I run the below Spock test, the first value printed is 0, not 1. What is going on here?

class RangeTest extends Specification {
    def "test range"() {
        expect:
        (0<..5).each {
            println it
        }
    }
}