if o.mapping == nil && enable {
			o.mapping = normalize
		}
		o.trie = trie
		o.checkJoiners = enable
		o.checkHyphens = enable
		if enable {
			o.fromPuny = validateFromPunycode
		} else {
			o.fromPuny = nil
		}
	}
}

// CheckHyphens sets whether to check for correct use of hyphens ('-') in
// labels. Most web browsers do not have this option set, since labels such as

		if o.mapping == nil && enable {
			o.mapping = normalize
		}
		o.trie = trie
		o.checkJoiners = enable
		o.checkHyphens = enable
		if enable {
			o.fromPuny = validateFromPunycode
		} else {
			o.fromPuny = nil
		}
	}
}

// CheckHyphens sets whether to check for correct use of hyphens ('-') in
// labels. Most web browsers do not have this option set, since labels such as