You make a valid point(++), so I will modify my proposed behaviour statement to:

Elements of @_ are aliased to EXISTING or EXPLICITLY-passed element(s) of the passed parameter(s).
The sub may modify ONLY THESE elements. Attempts to modify othe elements will not be retained on sub exit.

     "An undefined problem has an infinite number of solutions." - Robert A. Humphrey         "If you're not part of the solution, you're part of the precipitate." - Henry J. Tillman

In reply to Re^5: perlsub question.. by NetWallah
in thread perlsub question.. by Anonymous Monk

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