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use feature ":5.14";
use warnings FATAL => qw(all);
...
aaa({});
aaa(undef);
aaa(0);

{ a => 1 }
{ a => 1 }
Can't use string ("0") as a HASH ref while "strict refs" in use at C:\
+Phil\Perl\PerlMonks\undef2.pm line 8.