[ruby-core:101113] [Ruby master Feature#17322] Deprecate `Random::DEFAULT` and introduce `Random.default()` method to provide Ractor-supported default random generator

Issue #17322 has been updated by nobu (Nobuyoshi Nakada).


Eregon (Benoit Daloze) wrote in #note-10:
> Is this needed? It sounds very bad practice from a security point of view to ever be able to read the seed directly
> (without also changing it at the same time like `srand`).

As you **must not** use the default RNG for security purpose, it doesn't matter.

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Feature #17322: Deprecate `Random::DEFAULT` and introduce `Random.default()` method to provide Ractor-supported default random generator
https://bugs.ruby-lang.org/issues/17322#change-88790

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
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`Random::DEFAULT` a default random generator used by `rand`, `srand`, `Array#shuffle` without a given random generator, and so on.

Random generators are not thread-safe, so they are not ractor safe, and they are not shareable.
So a program refer to `Random::DEFAULT` on non-main ractor, it causes an error.

To provide per-ractor default random generator, this ticket propose the `Random.default()` method which returns per-ractor random generator.
`Random::DEFAULT` is a result of `Random.default()` on main-ractor and it should be deprecated, or at least it should not be used on multi-ractor supporting apps and libraries.





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