Add JSON.pm to third_party

third_party/JSON/JSON-2.59/t/xe10_bignum.t

+
+use strict;
+use Test::More;
+BEGIN { plan tests => 6 };
+
+BEGIN { $ENV{PERL_JSON_BACKEND} = 1; }
+
+use JSON -support_by_pp;
+
+eval q| require Math::BigInt |;
+
+
+SKIP: {
+    skip "can't use JSON::XS.", 6, unless( JSON->backend->is_xs );
+    skip "Can't load Math::BigInt.", 6 if ($@);
+
+my $json = new JSON;
+print $json->backend, "\n";
+
+$json->allow_nonref->allow_bignum(1);
+$json->convert_blessed->allow_blessed;
+
+my $num  = $json->decode(q|100000000000000000000000000000000000000|);
+
+isa_ok($num, 'Math::BigInt');
+is($num, '100000000000000000000000000000000000000');
+is($json->encode($num), '100000000000000000000000000000000000000');
+
+$num  = $json->decode(q|2.0000000000000000001|);
+
+isa_ok($num, 'Math::BigFloat');
+is($num, '2.0000000000000000001');
+is($json->encode($num), '2.0000000000000000001');
+
+
+}