[ruby-core:114309] [Ruby master Feature#19787] Add Enumerable#uniq_map, Enumerable::Lazy#uniq_map, Array#uniq_map and Array#uniq_map!

Issue #19787 has been reported by joshuay03 (Joshua Young).

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Feature #19787: Add Enumerable#uniq_map, Enumerable::Lazy#uniq_map, Array#uniq_map and Array#uniq_map!
https://bugs.ruby-lang.org/issues/19787

* Author: joshuay03 (Joshua Young)
* Status: Open
* Priority: Normal
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I would like to propose a collection of new methods, `Enumerable#uniq_map`, `Enumerable::Lazy#uniq_map`, `Array#uniq_map` and `Array#uniq_map!`.

TL;DR: It's a drop in replacement for `.map { ... }.uniq`, with better performance.

I've quite often had to map over an array and get its unique elements. It occurred to me when doing so recently that Ruby doesn't have a short form method for doing that, similar to how `flat_map { ... }` replaces `.map { ... }.flatten` and `filter_map { ... }` replaces `.map { ... }.compact` (with minor differences). I think these new methods could be beneficial both in terms of better performance and writing more succinct code.

I have already got a draft PR up with some initial benchmarks in the description: https://github.com/ruby/ruby/pull/8140.



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