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use strict;
use warnings;
...
say sort &get_keys();        # called:array:13
say sort @{[get_keys]};      # called:array:13
say sort @{[get_keys()]};    # called:array:13

           NAME(LIST);    # & is optional with parentheses.
           NAME LIST;     # Parentheses optional if predeclared/import
+ed.
           &NAME(LIST);   # Circumvent prototypes.

for my $type ( sort( filetypes_supported() ) ) {