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my %hash = (
   'w',
...
   y => $y,
   z => $z,
);

my %hash = (
   w => w(),  # Returns <1 or >1 elements
...
   y => $y,
   z => $z,
);

(
    size => 374205,                 \ or vice-versa
...
    tempname => "/tmp/5xSW7Swasp",
    filename => "aaa.jpg",
)