[ruby-core:69452] [Ruby trunk - Feature #10017] Add `Hash#fetch_values`

Issue #10017 has been updated by Wojtek Mach.

Subject changed from Add `Hash#fetch_values!` to Add `Hash#fetch_values`

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Feature #10017: Add `Hash#fetch_values`
https://bugs.ruby-lang.org/issues/10017#change-52724

* Author: Wojtek Mach
* Status: Assigned
* Priority: Normal
* Assignee: Yukihiro Matsumoto
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I'm proposing to add a new method `Hash#values_at!` that's basically a combination of `#values_at` and `#fetch`.

When dealing with configuration I prefer to use `#fetch` to fail early and this would be useful to read multiple keys at a time.
An example (not strictly on a Hash, but you get the idea) could be:

```ruby
repo, token = ENV.values_at!('GITHUB_REPO', 'GITHUB_TOKEN')

ENV.values_at!('INVALID') # raises KeyError

# not sure if that useful, but I provide it here for the sake of completeness
ENV.values_at!("SHELL", "INVALID") { |k| k + " is missing" } # => ["/bin/bash", "INVALID is missing"]
```

Another name for this could be `#fetch_at`, perhaps.

P.S. I'm attaching a patch that was done using mostly trial and error

---Files--------------------------------
values_at_bang.patch (1.53 KB)
fetch_at.patch (2.18 KB)


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