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  1. or download this
    I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
    
  2. or download this
    sub foo :lvalue {
       LVALUE {
    ...
          ...
       }
    }
    
  3. or download this
    use Variable::Magic qw( wizard cast );
    
    ...
          }
       }
    }