... filter out undefined values ... [emphasis added]

My take is that keys with undefined values (either because non-existent or undef) are to be filtered out. One way:

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my %args = ('profile' => 'foo',  'xyzzy' => undef,  'status' => 0);
 my %ta =
   map { defined $args{$_} ? ($_ => $args{$_}) : () }
   qw(profile  password  xyzzy  status)
   ;
 dd 'filtered', \%ta;
 dd 'original', \%args;
"
("filtered", { profile => "foo", status => 0 })

("original", { profile => "foo", status => 0, xyzzy => undef })
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