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use 5.012; # strict, //
use warnings;
...
JSON::VERSION = 4.02

Can't locate object method "boolean_values" via package "JSON" at Perl
+-Testing/JSON-boolean_values.pl line 11.

Debian GNU/Linux 10

ii  libjson-perl                          4.02000-1                   
+                all          module for manipulating JSON-formatted d
+ata
ii  libjson-xs-perl                       3.040-1+b1                  
+                amd64        module for manipulating JSON-formatted d
+ata (C/XS-accelerated)

package JSON;

...
By default, JSON booleans will be decoded as overloaded
C<$JSON::false> and C<$JSON::true> objects.