When you want to have the same function react differently based on the amount of arguments...
If you were talking about C++ code, I'd understand perfectly what you were talking about: function overloading based on differing function signatures (prototypes). As you are talking about Perl code, I don't. I still imagine two functions F with different prototypes that are differentially invoked based on differing argument lists, and that doesn't work in Perl.
Can you give a short, standalone, runnable example of what you were doing?
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