[ruby-core:112866] [Ruby master Feature#19528] `JSON.load` defaults are surprising (`create_additions: true`)

Issue #19528 has been reported by byroot (Jean Boussier).

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Feature #19528: `JSON.load` defaults are surprising (`create_additions: true`)
https://bugs.ruby-lang.org/issues/19528

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
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I'm not sure if it was actually intended, but there's some tacit naming convention for serializers in Ruby to use `load` and `dump` as methods, likely inspired from `Marshal` and `YAML`.

Because of this it's extremely common to see code that uses `JSON.load` expecting a simple, no surprise, and safe JSON parsing.

However that's `JSON.parse`.

`JSON.load` has this very surprising behavior (albeit perfectly documented), of de-serializing more complex types:


```ruby
>> JSON.load('{ "json_class": "String", "raw": [72, 101, 108, 108, 111] }')
=> "Hello"
```

It's particularly weird because aside from the `String` extension that is eagerly defined, for other types you have to `require "json/add/core"`.

Seasoned Ruby developers know about this of course, and [it is banned by various linters](https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Security/JSONLoad), but it keeps popping regularly in gems security releases and such.

### Proposal

Assuming entirely removing this feature is not an option, I think `json 2.x` should warn when this feature is actually being used, and `json 3.x` should disable it by default and require users to explicitly use `JSON.load(str, create_additions: true)` to keep the old behavior.



-- 
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