[ruby-core:122304] [Ruby Bug#21375] Set[] does not call #initialize

Issue #21375 has been updated by nobu (Nobuyoshi Nakada).


I'm not sure if it is intentional or not.
If unintentional, this patch may fix it.

```diff
diff --git a/set.c b/set.c
index 8676c62cd35..c41781c446f 100644
--- a/set.c
+++ b/set.c
@@ -409,13 +409,7 @@ static VALUE
 set_s_create(int argc, VALUE *argv, VALUE klass)
 {
     VALUE set = set_alloc_with_size(klass, argc);
-    set_table *table = RSET_TABLE(set);
-    int i;
-
-    for (i=0; i < argc; i++) {
-        set_table_insert_wb(table, set, argv[i], NULL);
-    }
-
+    rb_obj_call_init(set, argc, argv);
     return set;
 }
 
```

----------------------------------------
Bug #21375: Set[] does not call #initialize
https://bugs.ruby-lang.org/issues/21375#change-113447

* Author: Ethan (Ethan -)
* Status: Open
* ruby -v: ruby 3.5.0dev (2025-05-26T17:42:35Z master 909a0daab6) +PRISM [x86_64-darwin22]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
I have a subclass of Set that overrides #initialize. Following #21216, .new does call #initialize but .[] does not.

```ruby
class MySet < Set
  def initialize(enum = nil)
    compare_by_identity
    super
  end
end

MySet.new.compare_by_identity?
# => true
MySet[].compare_by_identity?
# => false
```



-- 
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