Meditation are good for meditating - so this thread is teaching me something about refactoring (which is theoretical), and something about tainting (which is practical). This is good for me.
I like very much your solution. In particular, it makes me reflect that an in-place detainting could be dangerous, because I could end up not knowing whether a variable has already been detainted or not. Your approach seems to divide variables into two groups: tainted and not, and this seems reasonable.
I only wonder how readability could be affected by this approach. The detainting method being under the surface, I fear that the naive programmer (er.. me) could be disorientated by seeing such an assignment and seeing $var used in potentially dieing places.
Flavio (perl -e "print(scalar(reverse('ti.xittelop@oivalf')))")
Don't fool yourself.
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