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  1. or download this
    $ cat pm_11145036_parm_defaults.json
{
...
    "margin-vertical" : [ null, "margin" ],
    "margin" : [ 10, null ]
}
  2. or download this
    #!/usr/bin/env perl

...
print 'margin = ', _get('margin'), "\n";
_set('margin', 50);
print 'margin = ', _get('margin'), "\n";
  3. or download this
    margin-left = 10
margin-left = 20
...
margin = 10
Can't change factory default: 'margin'.
margin = 10