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  1. or download this
    use strict;
use warnings;
...

Dump $copy;
print(blessed(\$copy)?1:0, "\n");  # 0
  2. or download this
    SV = PVMG(0x18c5614) at 0x182a39c
  REFCNT = 2
...
  CUR = 25
  LEN = 28
0