From: Hans Mackowiak <lists@...>
Date: 2013-03-10T05:23:58+09:00
Subject: Re: type casting and connversion in ruby

sample:

[4,5,6][1.2] #=>5

this works because Array#[] calls to_int if the index is no Integer, 
thats why Numeric works too

String does define to_i but no to_int, so

[4,5,6]["1.2"] #=> TypeError

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