[ruby-core:101249] [Ruby master Feature#17312] New methods in Enumerable and Enumerator::Lazy: flatten, product, compact

Issue #17312 has been updated by zverok (Victor Shepelev).


PR for `#compact`: https://github.com/ruby/ruby/pull/3851

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Feature #17312: New methods in Enumerable and Enumerator::Lazy: flatten, product, compact
https://bugs.ruby-lang.org/issues/17312#change-88928

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
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(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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