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  1. or download this
    if (exists $xlist{$name} && defined $xlist{$name}) {
 $xlist{$name} = undef; # this exists now
  2. or download this
    if (defined $xlist{$name}) {
  3. or download this
    22:44 >perl -Mstrict -MData::Dump -wE "my %h = (a => 1, b => undef); d
+d \%h; say $_, defined $h{$_} ? ': yes' : ': no' for qw(a b c); dd \%
+h;"
{ a => 1, b => undef }
...
{ a => 1, b => undef }

22:47 >