Let's look into
perlsyn to figure this one out... Ah, here it is:
Foreach Loops
The foreach loop iterates over a normal list value and
sets the variable VAR to be each element of the list in
turn. If the variable is preceded with the keyword my,
then it is lexically scoped, and is therefore visible only
within the loop. Otherwise, the variable is implicitly
local to the loop and regains its former value upon
exiting the loop. If the variable was previously declared
with my, it uses that variable instead of the global one,
but it's still localized to the loop.
So, the loop variable is always local to the loop, whether it's a lexical or a package variable.
