Perl 5's roots in Perl 1 show through sometimes. This is especially evident in the fact that variables are global by default and lexical only by declaration. The strict pragma helps, but adding that to a large program that's only grown over time (in the sense that kudzu grows) can make programs difficult to manage.
One problem of refactoring such a program is that it's difficult to tell by reading whether a particular variable is global or lexical, especially when any declaration may have come hundreds or thousands of lines earlier. Your friends and co-workers may claim that you can't run a program to analyze your program and find these global variables, but you can!more...
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