I installed ruby-2.0.0-p195 on Windows 7 Premium Home Edition (64-bit)
but it has 32-bit numbers versus 64-bit ones.

So if you do this you get
> (2**32).class
=>  Bignum

For a 64-bit build numbers should be Fixnum all the way up to (2**63-1).

On my VirtualBox install of Linux Mint 14 (64-bit) that is what I get
for rvm install of ruby-2.0.0-p195

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