[ruby-core:98113] [Ruby master Bug#16825] JSON#generate gives invalid json string

Issue #16825 has been reported by definitely_not_a_bot (Definitely Not A Bot).

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Bug #16825: JSON#generate gives invalid json string
https://bugs.ruby-lang.org/issues/16825

* Author: definitely_not_a_bot (Definitely Not A Bot)
* Status: Open
* Priority: Normal
* ruby -v: 2.6.5
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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Hello Guys! First of all, thank you for working on the Ruby language.

I observed a peculiarity while playing around with `JSON#generate`. When hash contains keys of the same word/literal but as symbol and string in the same hash, the `JSON#generate` creates JSON string with a duplicate key.

```ruby
require 'json'

my_hash = { key: "symbol", "key" => "string" }

JSON.generate(my_hash) #=> "{\"key\":\"symbol\",\"key\":\"string\"}"

```

Expected: 
```ruby
JSON.generate(my_hash) #=> "{\"key\":\"string\"}"
```

I am new to ruby, so not sure if this right platform to report this observation. I do feel like the current result is the desired result but found it little odd behavior.

Please do close this issue if, it is not the right platform for the issue or it is the intended behavior.



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