At Filehandles vs. Packages: And the winner is... converter found an "interesting" feature of Perl. A short demonstration of it is: 
perl -e 'sub new {die@_} main->new(); open main, "foo"'

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which fails to find your new method in package main because main is being interpreted as a glob, not as a class name. The following snippet fixes that for some values of fix (as long as you don't later want to use IO::Handle of course).

Of course if in package IO::Handle you were to open a filehandle named CGI, then the workaround stops working...

package IO::Handle;

sub new {
  *{shift(@_)}{NAME}->new(@_);
}

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In reply to Unconfuse filehandles and classes by tilly

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