JSON vs JSON5 benchmark results

JSON5#parse x 327 ops/sec ±6.58% (31 runs sampled)
JSON#parse x 5,940 ops/sec ±5.23% (76 runs sampled)
JSON5#stringify x 1,270 ops/sec ±1.38% (85 runs sampled)
JSON#stringify x 13,748 ops/sec ±2.06% (84 runs sampled)