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  1. or download this
    if ($something) {
   ...
}
  2. or download this
    has something => (
   is  => 'ro',
   isa => 'Bool',
);
  3. or download this
    has something => (
   is  => 'ro',
   isa => 'Any', # Bool
);
  4. or download this
    has something => (
   is     => 'ro',
   isa    => Bool->plus_coercions(Any, q{ !!$_ }),
   coerce => 1,
);