[ruby-core:108040] [Ruby master Feature#18566] Merge `io-wait` and `io-nonblock` gems into core IO

Issue #18566 has been updated by byroot (Jean Boussier).

Status changed from Open to Closed

Closing in favor of [Feature #18655], since `wait_readable` and `wait_writable` are really the two method I personally care about.

I suggest people who feel strongly about other methods from `io-wait / io-nonblock` open individual feature requests for each method or group of method that they think should be merged.

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Feature #18566: Merge `io-wait` and `io-nonblock` gems into core IO
https://bugs.ruby-lang.org/issues/18566#change-97000

* Author: byroot (Jean Boussier)
* Status: Closed
* Priority: Normal
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I think we should reconsider status of `io-wait`, and consider simply merging it into core's `IO`.

According to @nobu it's only a gem for "historical" reasons.

Any non trivial IO code will likely make use of it, and it's just 400 lines of code.

Recently with the extraction of `net-protocol`, it was added add a dependency and that caused Ruby 3.1 compatibility issues with some gems (e.g. with [`mail`](https://github.com/mikel/mail/pull/1439)).

### Proposal

  - Merge `io-wait` into `io.c` for Ruby 3.2
  - Remove `io-wait` as a dependency of all gems maintained by `ruby-core` (e.g. `net-protocol`).
  - Publish a new `io-wait` version that is simply an empty gem.
  - Add a `lib/io/wait.rb` stub, with eventually a deprecation warning.

cc @eregon @headius @mame @ioquatix



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