Using JS typed arrays in JoinFloat

Hi,

Has anyone thought of using JS typed arrays in the splitFloat and joinFloat methods for the JavaScript library (https://github.com/google/protobuf/blob/master/js/binary/utils.js#L388)?

One could imagine adding something like:

jspb.utils.joinFloat64 = function(bitsLow, bitsHigh) {
    if (window.Uint32Array) {
        bytes = Uint8Array.of(bitsLow, bitsHigh)
        data = new Float64Array(bytes.buffer)
        return data[0];
    }
    // ...
}

And vica-versa for the splitFloat method. This might increase readability (and depending on if it taps into the JS engine's native implementation, maybe even speed).

Happy to write the PR, just curious if it would be useful / appreciated!

Let me know,

js/binary/utils.js の 388 行目付近から始め、splitFloat と joinFloat の実装、およびその周辺の互換性ロジックを読みます。既存のフォールバック動作を失わずに、そこで typed arrays を使用できるか評価してください。両方のメソッドがサポート対象のすべての環境で引き続き正しく動作し、変更がレビュー可能な状態になれば作業完了です。