It makes testing for JSON errors very tedious. You either have
to use a Regexp or to regularly update all your assertions
when JSON is upgraded.

https://github.com/flori/json/commit/de9eb1d28e

When `HAVE_RB_ENC_INTERNED_STR` is enabled it is possible to
pass through a null pointer to `rb_enc_interned_str` resulting
in a segfault

Fixes #495

https://github.com/flori/json/commit/b59368a8c2

https://github.com/flori/json/commit/75ada77b96

Co-authored-by: Bruno Gomes da Silva <brunojabs@gmail.com>

* type-limits when plain-char is unsigned
* unused-const-variable for NFA constants

[ci 2]

https://github.com/flori/json/commit/1982070cb8

https://github.com/flori/json/commit/f398769332

Stop BigDecimal-specific optimization.  Instead, it tries the conversion
methods in the following order:

1. `try_convert`,
2. `new`, and
3. class-named function, e.g. `Foo::Bar.Baz` function for `Foo::Bar::Baz` class

If all the above candidates are unavailable, it fallbacks to Float.

If set to true all parsed objects will be
immediately frozen, and strings will be
deduplicated if the Ruby implementation
allows it.

When use non-frozen string for hash key with `rb_hash_aset()`, it will duplicate and freeze it internally.
To avoid duplicate and freeze, this patch will give a frozen string in `rb_hash_aset()`.

```
Warming up --------------------------------------
                json    14.000  i/100ms
Calculating -------------------------------------
                json    148.844  (± 1.3%) i/s -    756.000  in   5.079969s
```

```
Warming up --------------------------------------
                json    16.000  i/100ms
Calculating -------------------------------------
                json    165.608  (± 1.8%) i/s -    832.000  in   5.025367s
```

```
require 'json'
require 'securerandom'
require 'benchmark/ips'

obj = []

1000.times do |i|
  obj << {
    "id": i,
    "uuid": SecureRandom.uuid,
    "created_at": Time.now
  }
end

json = obj.to_json

Benchmark.ips do |x|
  x.report "json" do |iter|
    count = 0
    while count < iter
      JSON.parse(json)
      count += 1
    end
  end
end
```

https://github.com/flori/json/commit/18292c0c1d