From: Hans Mackowiak <lists@...>
Date: 2013-02-24T21:12:36+09:00
Subject: Re: Confusion with `nil` value being produced by IRB in case of Array#size manipulation.

its because ruby does not make a difference in Array#[] if the element 
is nil or non existendt ...

array = [nil]
array[0] #=> nil

array[1] #=> nil

see? there is no difference and no error!

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