Pass a code reference to the default function to the callback function? e.g.
$self -> {CALLBACK} = sub {
    my $self = shift;
    my $default = shift;
    my @args = @_;
    ( "arg condition here" ) and return $default -> (@args);
    ...
}

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One world, one people

In reply to Re: chaining callbacks by anonymized user 468275
in thread chaining callbacks by John M. Dlugosz

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