From: Suicidal Penguin <lists@...>
Date: 2013-08-05T13:32:39+09:00
Subject: Re: Why does the next() method behave this way?

Think of it as mathematics:
z is 9
when you do z.next which is equivalent to 9+1 which results in 1 carry 
to the digit the the left.

So think of baz as 219
baz.next => 219+1 = 220
so in this case z will be incremented to a,
a will get the carry from z and increment to b.

Hope that helps.

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