Yesterday I had a 'DOH' moment twice. One moment twice? Yes ;-) The second one was a deja-vu because it was the same mistake in the same sub at another position.
What I learned from it is: NEVER EVER use if ( $somevariable ) if you really wanted if ( $somevariable ne '' )
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(8)As of 2017-01-24 18:30 GMT