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  1. or download this
    use v5.14;
use strict;
...
ValAtom->new(data => []);           # ArrayRef
ValAtom->new(data => {});           # HashRef
ValAtom->new(data => \*STDOUT);     # none of the above... crash!
  2. or download this
    my $tc = ValAtom->meta->get_attribute('data')->type_constraint;
say $tc->_inline_check('$value') if $tc->can_be_inlined;