[ruby-core:120133] [Ruby master Feature#20935] API for Globally Enabling/Disabling Happy Eyeballs Version 2 in the Socket Class

Issue #20935 has been reported by shioimm (Misaki Shioi).

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Feature #20935: API for Globally Enabling/Disabling Happy Eyeballs Version 2 in the Socket Class
https://bugs.ruby-lang.org/issues/20935

* Author: shioimm (Misaki Shioi)
* Status: Open
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When introducing Happy Eyeballs Version 2 to `Socket.tcp` (https://bugs.ruby-lang.org/issues/20108), it was pointed out that there should be a way to disable this feature (https://bugs.ruby-lang.org/issues/20108#note-7).

To address this, I added `fast_fallback: true or false` keyword argument to both `Socket.tcp` and `TCPSocket.new`.
Additionally, I introduced two singleton methods to the `Socket` class: `tcp_fast_fallback=` and `tcp_fast_fallback`.

These can be used as follows:

```ruby
Socket.tcp(host, port, fast_fallback: true)
TCPSocket.new(host, port, fast_fallback: true)

# Globally controlling HEv2
Socket.tcp_fast_fallback = true # => true
Socket.tcp_fast_fallback # => true
```

I apologize for this after the implementation, but I would like to discuss whether adding these APIs is appropriate.



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