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# Possibly named argument syntax:
threads->create('stack' => $size,
...
threads->create( { 'stack' => $size,
                   'code'  => 'function', # or sub{} or \&func
                   'args'  => ... } );

# Set the 'default' thread stack size
threads->set_stack_size(1_000_000);
...
    my @args = @_;
    ...
}