The previous post on the blog actually talked about WHY we picked Haxe to do client/server development so we didn't have to write a ton of duplicate code. As a bonus, it's just a great language with a good community and active developers.
[1]: http://blog.juiceboxmobile.com/2012/11/20/benchmarking-web-f...
However, the (old, forked) version of Mono used by Unity does not appear to inline functions - at least not when using the ahead-of-time compilation required to run on iOS.