Issue #18273 has been updated by byroot (Jean Boussier).


To me it behave just like weak references do:

```ruby
weakmap = ObjectSpace::WeakMap.new
weakmap[Object.new] = Object.new
weakmap.keys # => [#<Object:0x00007ff6329049c8>]
# GC.start
weakmap.keys # => []
```

I really see no problem with that.



----------------------------------------
Feature #18273: Class#subclasses
https://bugs.ruby-lang.org/issues/18273#change-96112

* Author: byroot (Jean Boussier)
* Status: Closed
* Priority: Normal
----------------------------------------
Ref: https://github.com/rails/rails/pull/43481

Something we forgot to mention in [Feature #14394], is either a parameter or another method to only get direct descendants.

Active Support has been offering `Class.subclasses` as:

```ruby
  def subclasses
    descendants.select { |descendant| descendant.superclass == self }
  end
```

It seems a bit silly to grab all descendants and then restrict the list when `Class#descendants` had to do some recursion to get them all in the first place.

### Proposal

We could either implement `Class#subclasses` directly, or accept a parameter in `Class#descendants`, e.g. `descendants(immediate = false)`.

cc @eregon



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