in reply to Re: Attempt to free non-existent shared string 'io_socket_type', Perl interpreter: 0x84972e0 during global destruction.
in thread Attempt to free non-existent shared string 'io_socket_type', Perl interpreter: 0x84972e0 during global destruction.

The problem is not just about the print statement. The problem is about the error 'attempt to free non-existent shared string' sent by the Perl interpreter.
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