[ruby-core:100833] [Ruby master Feature#17312] New methods in Enumerable and Enumerator::Lazy: flatten, product, compact

Issue #17312 has been updated by Dan0042 (Daniel DeLorme).


What would be the interaction between Array#flatten and Enumerable#flatten ?
It's a big compatibility problem if flatten recursively applies to any Enumerable object within an array.

```ruby
x = Struct.new(:a).new(1)  #=> #<struct a=1>
[[[x]]].flatten            #=> [x] currently
Enumerable === x           #=> true
x.to_a                     #=> [1]
[[[x]]].flatten            #=> [1] would be a problem
```

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Feature #17312: New methods in Enumerable and Enumerator::Lazy: flatten, product, compact
https://bugs.ruby-lang.org/issues/17312#change-88475

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
----------------------------------------
(The offspring of #16987, which was too vague/philosophical)

I propose to add to `Enumerable` and `Enumerator::Lazy` the following methods:
* `compact`
* `product`
* `flatten`

All of them can be performed with a one-way enumerator. All of them make sense for situations other than "just an array". All of them can be used for processing large sequences, and therefore meaningful to add to `Lazy`.



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