[ruby-core:75799] [Ruby trunk Feature#12447] Integer#digits for extracting digits of place-value notation in any base

Issue #12447 has been reported by Kenta Murata.

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Feature #12447: Integer#digits for extracting digits of place-value notation in any base
https://bugs.ruby-lang.org/issues/12447

* Author: Kenta Murata
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
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I sometimes want to extract digits of place-value notation of integer numbers.
One typical use case is calculating checksum digit.
I found some code extracting digits by the way like `int.to_s.chars.map(&:to_i)`.

- https://github.com/joeljunstrom/ruby_luhn/blob/master/lib/luhn.rb#L43
- https://github.com/elitwin/check_digit/blob/master/lib/check_digit/damm.rb#L28
- https://github.com/elitwin/check_digit/blob/master/lib/check_digit/luhn.rb#L14
- https://github.com/elitwin/check_digit/blob/master/lib/check_digit/verhoeff.rb#L42

Introducing Integer#digits can reduce needless string allocation in such cases.

The patch was pushed into the repository in github.
https://github.com/mrkn/ruby/commit/6072e8a53bc67c40969b7749ed9d7f02ec0eb458



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