Symbol::gensym
In Perl is impossible to create a GLOB that exists only in the scope. Soo, gensym() creates a new GLOB at Symbol::GENx, where x is a number. Soo, it won't be cleanned when you go out of the scope. Again you will be just duplicating everything.
Symbol::gensym does create its symbols in the Symbol:: package, but then removes them from the package, so when a returned symbol goes out of scope it does get garbage collected. If you think you get a leak doing this, report it as a bug, with a short test case.
Also, your undefs of each type (and close of the file handle) should never be needed; if you can come up with a short test case that shows a problem, please report this as a perl bug also.
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