So I wanted to use Getopt::Long's auto_version feature on a script that I use. It requires a package variable named $VERSION to be set, and I have at least three options for doing so:

• use vars qw($VERSION);
  $VERSION = 1.3;
  [download]

• our $VERSION = 1.3;
• $main::VERSION = 1.3;

I have verified that all of these work, and I understand that the first two allow me to refer to the variable as $VERSION within package and lexical scope, respectively. My question is: Is any one of these preferable? I don't plan on referring to the version number anywhere else in the script.

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