type streamSafe uint8

// first inserts the first rune of a segment. It is a faster version of next if
// it is known p represents the first rune in a segment.
func (ss *streamSafe) first(p Properties) {
	*ss = streamSafe(p.nTrailingNonStarters())
}

// insert returns a ssState value to indicate whether a rune represented by p
// can be inserted.
func (ss *streamSafe) next(p Properties) ssState {
	if *ss > maxNonStarters {

type streamSafe uint8

// first inserts the first rune of a segment. It is a faster version of next if
// it is known p represents the first rune in a segment.
func (ss *streamSafe) first(p Properties) {
	*ss = streamSafe(p.nTrailingNonStarters())
}

// insert returns a ssState value to indicate whether a rune represented by p
// can be inserted.
func (ss *streamSafe) next(p Properties) ssState {
	if *ss > maxNonStarters {