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Although not exactly what you want:
mysubclass->new({ myclass => { value = 23 }});
works. another solution would be to add a default value to myclass->value so that a missing initializer label does not throw a fatal error. To set a new default value, overriding the START method seems to work:
package myclass; use Class::Std; my %value :ATTR( :name<value> :default(1)); 1;
package mysubclass; use base qw(myclass); sub START { my ($self, $ident, $arg_ref) = @_; $self->set_value(123) if !defined $arg_ref->{value}; } 1;
UPDATE: original version ignored initializer labels.

In reply to Re: Overriding arguments in Class::Std superclass constructors by lima1
in thread Overriding arguments in Class::Std superclass constructors by fce2

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