From: Student Jr <lists@...>
Date: 2013-02-06T11:43:54+09:00
Subject: Re: Symbol.defined?

When a symbol is defined, the memory used to store the symbol is 
permanently lost.  If one is parsing external input, this makes one's 
application vulnerable to DOS.

Secondarily, if while parsing external input, one refuses to make new 
symbols blindly, then the symbol list is something over which one has 
direct control, and it can be trusted in some situations to speed 
processing.

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