Neo

fix: encoding array

2

fix issue #28

I found that the statement `data instanceof Array` in [encoding.js](https://github.com/dmonad/lib0/blob/8eb3ba3e2615260225cd36bd56bb011cc6893f1a/encoding.js#L476) is incorrect when checking arrays across iframe, which expected to be true. Maybe `Array.isArray` is preferred? https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray#instanceof_vs_isarray