// If the domain is appropriate for the pre-extension Type,
	// repeat the update with the pre-extension Value.
	if isCleanExt(v) {
		switch {
		case d == signed && v.Args[0].Type.IsSigned():
			fallthrough
		case d == unsigned && !v.Args[0].Type.IsSigned():
			ft.update(parent, v.Args[0], w, d, r)
		}
	}
	if isCleanExt(w) {
		switch {
		case d == signed && w.Args[0].Type.IsSigned():
			fallthrough