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  1. or download this
    use Data::Dumper;
my $hashref={
...
      ....
      kN => {...., mydata => MyClass->new(), .... }}}};
print(Dumper($hashref));
  2. or download this
    ....
    mydata => bless(..., 'MyClass')
....
  3. or download this
    ....
    mydata => 'MyOwnRepresentation of the MyClass instance'
....
  4. or download this
    sub MyClass::myfreezer { ... }
$Data::Dumper::Freeze='myfreezer'