[ruby-core:120350] [Ruby master Bug#20974] Required and optional anonymous parameter show differently in Proc#parameters

Issue #20974 has been reported by alanwu (Alan Wu).

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Bug #20974: Required and optional anonymous parameter show differently in Proc#parameters
https://bugs.ruby-lang.org/issues/20974

* Author: alanwu (Alan Wu)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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The following has had the same output since Ruby 1.9, when Proc#parameters was [introduced]:


```ruby
p(proc   { |(_a)| }.parameters) # => [[:opt, nil]]
p(lambda { |(_a)| }.parameters) # => [[:req]]
```

I think they should be `[[:opt]]` and `[[:req]]` or `[[:opt, nil]]` and `[[:req, nil]]`. I prefer the nil-free option since that feels more anonymous. 

[added]: https://docs.ruby-lang.org/en/master/NEWS/NEWS-1_9_2.html



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