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my %foo;
@foo{qw/ foo bar baz /} = 1 .. 3;
...
    printf "%%foo = %s { %s } = ( %s )\n",\%foo,scalar %foo,
           join(",",map "$_ => $foo{$_}",keys %foo);
}

%foo = HASH(0x1ab298c) { 2/8 } = ( foo => 1,baz => 3,bar => 2 )
foo => 1 is gone.
...
%foo = HASH(0x1ab298c) { 1/8 } = ( bar => 2 )
bar => 2 is gone.
%foo = HASH(0x1ab298c) { 0 } = (  )