[ruby-core:85086] [Ruby trunk Feature#14399] Add Enumerable#product

Issue #14399 has been updated by shan (Shannon Skipper).


Array#product would stomp on Enumerable#product, and it confusingly does a different thing:

~~~ ruby
[2,3,5,7].product => [[2], [3], [5], [7]]
~~~

Maybe Enumerable#multiply would compliment Enumerable#sum?

----------------------------------------
Feature #14399: Add Enumerable#product
https://bugs.ruby-lang.org/issues/14399#change-69800

* Author: jzakiya (Jabari Zakiya)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
For similar reasons for creating `Enumerable#sum` a companion method
`Enumerable#product` is also very useful. Taking the product of
numbers in arrays is a common operation in many numerical algorithms,
especially in number theory and cryptography, and its optimization in
Ruby will make it more conducive to math heavy algorithms and tasks.

This

```
> [2,3,5,7].reduce(:*) => 210
```

can be optimized to this

```
> [2,3,5,7].product => 210
```

It should also allow an initial value

```
> [2,3,5,7].product(2) => 420

> [2,3,5,7].product(0.5) => 105
```
Crystal already has this `method`.



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