Mostly, I agree with you as I recognised in this thread from a while back--but a couple of self-quotes from my posts in this thread:

If your class lends itself to the technique, ...

And

Of course, if the content has to be verified then using an lvalue sub will also break, but that a different argument entirely:)
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algoritm, algorithm on the code side." - tachyon

In reply to Re^3: regex transforms of object attributes by BrowserUk
in thread regex transforms of object attributes by Tuppence

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