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you have changed context and $i is uninitialized within that context and therefor you are going to print zeros
Not exactly true. Try with
foreach (qw(a b)) {
Update: Do not use numbers for testing behaviour, see Re^3: variable declaration question.
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: foreach-loop-local var in sub by choroba
in thread foreach-loop-local var in sub by warshall

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