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  1. or download this
    if ( UNIVERSAL::isa( $obj, 'Class::I::am::checking::for' )){
  $obj->invoke_method();
}
  2. or download this
    my $ref = ref($obj);
if ( $ref && ($ref !~ /^(SCALAR|HASH|ARRAY)$/) ) {
  $obj->invoke_method();
}