>>It's a known bug (for a long time)

Actually, there is bug with preserveSingleQuotes().
The problem is only that is is not really a function.
First, all it does is to set a flag to tell CFQUERY not to escape
single quotes in the variable passed in parameter.
Then, calling it from outside a CFQUERY tag won't do nothing.
Secondly, the parameter passed to preserveSingleQuotes must be a variable,
not an expression nor directly a string. Thus 
preserveSingleQuotes(left(mystring, 10)) won't work.
If it did, and if it also worked outside the CFQUERY tag, it could be 
regarded a true function.

The bug is actually in the deficiency of the documentation which does not
explains this clearly at all.

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