As can be easily demonstrated by 
print prototype 'CORE::pack';

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pack evaluates the first argument in scalar context. If you supply an array, it turns into the number of its members. You got 1, which is double weird, as it means the array only had one member - you have to supply two things to pack, the template and the list (and, as we have just seen, you can't bundle them in one array).

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: SNTP pack and unpack by choroba
in thread SNTP pack and unpack by thanos1983

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