From: Hans Mackowiak <lists@...>
Date: 2013-03-17T23:19:53+09:00
Subject: Re: Confusion with `nil` output from the method Symbol#<=>

WHY DONT YOU GET IT?

this line:
https://github.com/ruby/ruby/blob/trunk/string.c#L2392

symbols does not have a to_str method, so this returns nil or maybe 
still the symbol

then because temp is not a String, it calls rb_invcmp
with tries to call symbol <=> string and you should allready know what 
that returns

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