language.Script(alt.haveScript) == s {
			return language.Script(alt.wantScript)
		}
	}
	return 0
}

// addIfNew adds a haveTag to the list of tags only if it is a unique tag.
// Tags that have the same maximized values are linked by index.
func (h *matchHeader) addIfNew(n haveTag, exact bool) {
	h.original = h.original || exact
	// Don't add new exact matches.
	for _, v := range h.haveTags {