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  1. or download this
    perl -wMstrict -E 'my $x="0x41"; my $y = \$x; say $y->$*'
    0x41
    
  2. or download this
    perl -wMstrict -E 'my $href={a=>1}; say $_ for keys $href->%*'
    a
    
  3. or download this
    perl -wMstrict -E 'my $href={a=>1}; say $_ for keys %{ $href }'
    a
    
  4. or download this
    perl -wMstrict -E 'my $href={a=>1}; say $_ for keys %$href'
    a