}
	readDataInto := func(dst []byte, s ws.State, want ws.OpCode) ([]byte, error) {
		dst = dst[:0]
		for {
			hdr, err := wsReader.NextFrame()
			if err != nil {
				return nil, err
			}
			if hdr.OpCode.IsControl() {
				if err := controlHandler(hdr, &wsReader); err != nil {
					return nil, err
				}
				continue
			}
			if hdr.OpCode&want == 0 {
				if err := wsReader.Discard(); err != nil {
					return nil, err