Item9326: Func::*Exists functions are too anal

Since I added the taint checks to the core, the *Exists functions in Func have required untainted data. Several extensions are guilty of not validating data, and will crash when they use these functions. This is not good, and it's avoidable.

I'm going to add a validation call to each of the Func methods to ensure they only pass untainted data on to the core.

-- CrawfordCurrie - 15 Jul 2010

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