#!/usr/local/bin/perl
#!/usr/bin/env perl
use v5.12;
use boolean -truth;
use JSON;
sub boolean::TO_JSON() { !$_[0] ? \0 : \1 }

my $json = JSON->new->convert_blessed;
my $bools = { false => ( 0 == 1 ), true => ( 1 == 1 ) };

eval { say encode_json($bools) };
warn $@ if $@;
say $json->encode($bools);