bm with caching pr merged in for reference

Benchmark results:
{
  "commit_hash": "3783610",
  "version": "0.10.0",
  "rails_version": "4.2.6",
  "benchmark_run[environment]": "2.2.3p173",
  "runs": [
    {
      "benchmark_type[category]": "caching on: caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 673.669,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1344
    },
    {
      "benchmark_type[category]": "caching on: fragment caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 625.877,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1435
    },
    {
      "benchmark_type[category]": "caching on: non-caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 1014.015,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1230
    },
    {
      "benchmark_type[category]": "caching off: caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 602.302,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1344
    },
    {
      "benchmark_type[category]": "caching off: fragment caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 562.782,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1435
    },
    {
      "benchmark_type[category]": "caching off: non-caching serializers: gc off",
      "benchmark_run[result][iterations_per_second]": 869.064,
      "benchmark_run[result][total_allocated_objects_per_iteration]": 1230
    }
  ]
}

Author: bf4