Safe::reval
   Safe::lexless_anon_sub
      main::L<13><08>N
         strict::unimport
   Opcode::_safe_call_sv
      main::p<FF><06><08>ON__
Safe::reval
   Safe::lexless_anon_sub
      main::L<13><08>N
         strict::unimport
   Opcode::_safe_call_sv
      main::p<FF><06><08>ON__
         main::fibonacci
            main::fibonacci
               (... and so on)