I entirely agree that letting cavalier coding errors slip silently by is a Very Bad Thing.

The pack function is one of those many built-in functions that is much improved by being wrapped with a fatalizing envelope. Something as simple as this should suffice:

*CORE::GLOBAL::pack = sub ($@) { 
    use warnings FATAL => "pack";
    return CORE::pack(shift(), @_);
};

[download]
That will catch a lot of bugs that risk being carelessly ignored.

Hope this helps.

In reply to Re^2: Simplest Possible Way To Disable Unicode by tchrist
in thread Simplest Possible Way To Disable Unicode by JapanIsShinto

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