From: Hans Mackowiak <lists@...>
Date: 2013-03-17T23:04:20+09:00
Subject: Re: Confusion with `nil` output from the method Symbol#<=>

both the functions return nil because

:x <=> "x" , "x" is not a symbol, so return nil
"x" <=> :x , :x does not respond to to_str, so return nil



if you "couldn't understand" C code, stop reading it and look at more 
easier tutorials

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