(https://github.com/ruby/json/pull/743)

See the pull request for the long development history: https://github.com/ruby/json/pull/743

```
== Encoding activitypub.json (52595 bytes)
ruby 3.4.2 (2025-02-15 revision https://github.com/ruby/json/commit/d2930f8e7a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
               after     2.913k i/100ms
Calculating -------------------------------------
               after     29.377k (± 2.0%) i/s   (34.04 μs/i) -    148.563k in   5.059169s

Comparison:
              before:    23314.1 i/s
               after:    29377.3 i/s - 1.26x  faster

== Encoding citm_catalog.json (500298 bytes)
ruby 3.4.2 (2025-02-15 revision https://github.com/ruby/json/commit/d2930f8e7a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
               after   152.000 i/100ms
Calculating -------------------------------------
               after      1.569k (± 0.8%) i/s  (637.49 μs/i) -      7.904k in   5.039001s

Comparison:
              before:     1485.6 i/s
               after:     1568.7 i/s - 1.06x  faster

== Encoding twitter.json (466906 bytes)
ruby 3.4.2 (2025-02-15 revision https://github.com/ruby/json/commit/d2930f8e7a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
               after   309.000 i/100ms
Calculating -------------------------------------
               after      3.115k (± 3.1%) i/s  (321.01 μs/i) -     15.759k in   5.063776s

Comparison:
              before:     2508.3 i/s
               after:     3115.2 i/s - 1.24x  faster
```

https://github.com/ruby/json/commit/49003523da