What is a double underscore in Perl?
perl, syntax
Solution
There is no specific meaning to the use of a __ inside of a perl variable name. It's likely programmer preference, especially in the case that you've cited in your question. You can see more information about perl variable naming here.
Problem
I'm trying to understand someone else's Perl code without knowing much Perl myself. I would appreciate your help. I've encountered a Perl function along these lines: ``` MyFunction($arg1,$arg2__size,$arg3) ``` Is there a meaning to the double-underscore syntax in `$arg2`, or is it just part of the name of the second argument?