Don't know, but one downside (upside?) is that your functions are no longer accessible from outside the package. That can easily be fixed by doing one of the following for exportable functions: 
*handleNewYear = my $handleNewYear = sub {
    # do something really useful
};

[download]
sub handleNewYear {
    # do something really useful
}

my $handleNewYear = \&handleNewYear;

[download]

In reply to Re^3: When -w and use strict aren't enough... by ikegami
in thread When -w and use strict aren't enough... by RMGir

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