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Python 2 to Python 3 is a big jump once in a lifetime. what about ruby 1.9 to ruby 2.0?

ruby 2.0 will likely be just as easy as 1.8 to 1.9, if not easier.

so, it's not as easy as python 2.x to 2.(x+1) and python 3.x to 3.(x+1). will every version update of Ruby will suffer as mush as Ruby 1.8 to 1.9?