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  1. or download this
    C:\test>p1
$h{ $_ } = 'xxxxxxxx' for 1 .. 1e6;;
...

print total_size( \%h );;
72277576
  2. or download this
    C:\test>p1
undef $h{ $_ } for 1 .. 1e6;;

print total_size( \%h );;
72277576