11-08-2014
That's a documented behavior in Perl and is called "autovivification".
Check the stackoverflow website for the question "How do I disable autovivification in Perl?" for a detailed discussion and workarounds.
gandolf989 has a point here. Any reason you do *not* want the intermediate branches to be created? As long as they are empty and your existence checks return the values as expected, your program should be fine.
Autovivification in Perl is by design. It's not a bug; it's a feature. And I think it stems from Perl's tendency to go out of its way to make your text processing task easy.
For an in-depth technical discussion of why it works like that, what its advantages are and what problems it solves, check this link:
http://www.sysarch.com/Perl/autoviv.txt
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