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in reply to Array got modified!

  1. Yes it is normal
  2. Yes, all versions.
From `perldoc perlsyn`, in the "Foreach Loops" section:
If any element of LIST is an lvalue, you can modify it by modifying VAR inside the loop. Conversely, if any element of LIST is NOT an lvalue, any attempt to modify that element will fail. In other words, the foreach loop index variable is an implicit alias for each item in the list that you're looping over.

In Section Seekers of Perl Wisdom