[ruby-core:101891] [Ruby master Feature#6362] Modular exponentiation/inverse

Issue #6362 has been updated by leahneukirchen (Leah Neukirchen).


As of Python 3.8, this is supported by Python's pow function, which can take a mod argument, just like Ruby's.
https://docs.python.org/3/library/functions.html#pow

I therefore propose to add this feature as

```
n.pow(-1, m)
```

This currently throws an error (`Integer#pow() 1st argument cannot be negative when 2nd argument specified`), so should be possible to extend.

----------------------------------------
Feature #6362: Modular exponentiation/inverse
https://bugs.ruby-lang.org/issues/6362#change-89732

* Author: MartinBosslet (Martin Bosslet)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
I'd like to ask your opinion about adding two methods for modular 
exponentiation/modular inverse to integer classes. Is this 
functionality too specific or would this be a welcome addition?



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