Commits on Jan 21, 2018

1. PERF: Recover changes_applied performance …

   rails#30985 caused `object.save` performance regression since calling
   `changes` in `changes_applied` is very slow.
   We don't need to call the expensive method in `changes_applied` as long
   as `@attributes` is tracked by mutation tracker.
   
   https://gist.github.com/kamipo/1a9f4f3891803b914fc72ede98268aa2
   
   Before:
   
   ```
   Warming up --------------------------------------
   create_string_columns
                           73.000  i/100ms
   Calculating -------------------------------------
   create_string_columns
                           722.256  (± 5.8%) i/s -      3.650k in   5.073031s
   ```
   
   After:
   
   ```
   Warming up --------------------------------------
   create_string_columns
                           96.000  i/100ms
   Calculating -------------------------------------
   create_string_columns
                           950.224  (± 7.7%) i/s -      4.800k in   5.084837s
   ```

   

   kamipo committed Jan 21, 2018
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