Commits on Jul 25, 2021

1. Improve Oj.dump performance …

   This patch uses standard C library to copy the string
   because copying one byte at a time is slow.
   
   This patch will improve `Oj.dump` performance as following.
   
   -                | before   | after    | result
   --               | --       | --       | --
   Oj.dump          | 689.236k | 1.853M   | 2.69x
   Oj.dump (compat) | 476.107k | 827.446k | 1.74x
   Oj.dump (rails)  | 464.545k | 644.494k | 1.39x
   
   ### Environment
   - MacBook Air (M1, 2020)
   - macOS 12.0 beta 3
   - Apple M1
   - Ruby 3.0.2
   
   ### Before
   ```
   Warming up --------------------------------------
                Oj.dump    69.210k i/100ms
       Oj.dump (compat)    47.123k i/100ms
        Oj.dump (rails)    45.911k i/100ms
   Calculating -------------------------------------
                Oj.dump    689.236k (± 0.2%) i/s -      3.460M in   5.020801s
       Oj.dump (compat)    476.107k (± 0.9%) i/s -      2.403M in   5.048128s
        Oj.dump (rails)    464.545k (± 0.9%) i/s -      2.341M in   5.040711s
   ```
   
   ### After
   ```
   Warming up --------------------------------------
                Oj.dump   187.096k i/100ms
       Oj.dump (compat)    82.879k i/100ms
        Oj.dump (rails)    64.371k i/100ms
   Calculating -------------------------------------
                Oj.dump      1.853M (± 0.3%) i/s -      9.355M in   5.049406s
       Oj.dump (compat)    827.446k (± 0.2%) i/s -      4.144M in   5.008145s
        Oj.dump (rails)    644.494k (± 0.2%) i/s -      3.283M in   5.093814s
   ```
   
   ### Test code
   ```ruby
   require 'benchmark/ips'
   require 'oj'
   
   data = {
     'short_string': 'a' * 50,
     'long_string': 'b' * 255,
     'utf8_string': 'あいうえお' * 10
   }
   
   Benchmark.ips do |x|
     x.report('Oj.dump') { Oj.dump(data) }
     x.report('Oj.dump (compat)') { Oj.dump(data, mode: :compat) }
     x.report('Oj.dump (rails)') { Oj.dump(data, mode: :rails) }
   end
   ```

   

   Watson1978 committed Jul 25, 2021
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