https://git.ruby-lang.org/ruby.git/commit/?id=3e7a7fb28a

From 3e7a7fb28a9a6a9544e1e49dfab51122ccfdac3f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 15 Jul 2021 21:33:39 +0900
Subject: Make Struct#keyword_init? return nil by default [Feature #18008]

---
 struct.c                 | 15 +++++----------
 test/ruby/test_struct.rb |  3 +++
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/struct.c b/struct.c
index 1284fd4..9207c62 100644
--- a/struct.c
+++ b/struct.c
@@ -356,19 +356,14 @@ rb_struct_s_inspect(VALUE klass) https://github.com/ruby/ruby/blob/trunk/struct.c#L356
  *
  * Examples:
  *   Foo = Struct.new(:a)
- *   Foo.keyword_init? # => false
+ *   Foo.keyword_init? # => nil
  *   Bar = Struct.new(:a, keyword_init: true)
  *   Bar.keyword_init? # => true
+ *   Baz = Struct.new(:a, keyword_init: false)
+ *   Baz.keyword_init? # => false
  */
-static VALUE
-rb_struct_s_keyword_init_p(VALUE klass)
-{
-    if (RTEST(rb_struct_s_keyword_init(klass))) {
-        return Qtrue;
-    } else {
-        return Qfalse;
-    }
-}
+
+#define rb_struct_s_keyword_init_p rb_struct_s_keyword_init
 
 static VALUE
 setup_struct(VALUE nstr, VALUE members)
diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index 000d229..1957726 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -144,6 +144,9 @@ module TestStruct https://github.com/ruby/ruby/blob/trunk/test/ruby/test_struct.rb#L144
 
     struct = @Struct.new(:a, :b, keyword_init: false)
     assert_equal(false, struct.keyword_init?)
+
+    struct = @Struct.new(:a, :b)
+    assert_nil(struct.keyword_init?)
   end
 
   def test_initialize
-- 
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