Do we actually need to have full ruby spec implemented? Don't forget 
about the 20/80 rule of the universe - there are only 20 % of features 
that provide 80% of value.

It seems that it's impossible in any time soon to create a full-featured 
Ruby JS. There were lots of project of this kind (HotRuby, RubyJS, Red, 
.... google github) and it seems that all of them are dead by now, 
although some of them got some attention in past.

But look at the success of CoffeeScript, it doesn't try to solve all 
problems at once, but it eliminates the most annoying problems.

Maybe it would be better do it in the same way? Take the core part, that 
can be easily implemented and leave the rest to the better time?

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