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I noticed that opportunity too. If anyone is looking for a fun project...

The next thing would be to have practices and/or libraries that switch techniques based on browser support.

Is was a fun project actually. https://github.com/creationix/msgpack-js-browser

Question out of curiosity: did you notice any performance improvements from using DataView and ArrayBuffer?

I never used the "official" js codec because it didn't exist when I started. My codec has been optimized for nodejs and does rather well there. I recently did a jsperf for the browser port (msgpack-js-vs-json) and while slower than the nodejs version, it looks a bit faster than the "official" one.

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