Commits on Oct 16, 2021

1. Optimize option value detection …

   This patch introduces functions same as rb_hash_has_key()
   to reduce rb_funcall() calling because it has a overhead.
   
   −               | before   | after    | result
   --               | --       | --       | --
   JSON.parse       | 302.109k | 343.547k | 1.14x
   JSON.generate    | 569.705k | 568.668k | −
   
   ### Environment
   - MacBook Air (M1, 2020)
   - macOS 12.0 beta
   - Apple M1
   - Ruby 3.0.2
   
   ### Before
   ```
   Warming up --------------------------------------
             JSON.parse    30.347k i/100ms
          JSON.generate    56.987k i/100ms
   Calculating -------------------------------------
             JSON.parse    302.109k (± 0.2%) i/s -      1.517M in   5.022546s
          JSON.generate    569.705k (± 0.2%) i/s -      2.849M in   5.001462s
   ```
   
   ### After
   ```
   Warming up --------------------------------------
             JSON.parse    35.109k i/100ms
          JSON.generate    57.611k i/100ms
   Calculating -------------------------------------
             JSON.parse    343.547k (± 0.3%) i/s -      1.720M in   5.007637s
          JSON.generate    568.668k (± 0.3%) i/s -      2.881M in   5.065486s
   ```
   
   ### Test code
   ```ruby
   require 'benchmark/ips'
   require 'json'
   
   json =<<-EOF
   {
     "$id": "https://example.com/person.schema.json",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "title": "Person",
     "type": "object",
     "properties": {
       "firstName": {
         "type": "string",
         "description": "The person's first name."
       },
       "lastName": {
         "type": "string",
         "description": "The person's last name."
       },
       "age": {
         "description": "Age in years which must be equal to or greater than zero.",
         "type": "integer",
         "minimum": 0
       }
     }
   }
   EOF
   
   Benchmark.ips do |x|
     x.report('JSON.parse') { JSON.parse(json, symbolize_names: true) }
   
     data = JSON.parse(json, symbolize_names: true)
     x.report('JSON.generate') { JSON.generate(json, indent: "\t") }
   end
   ```

   

   Watson1978 committed Oct 16, 2021
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