https://git.ruby-lang.org/ruby.git/commit/?id=ceb9d516c6

From ceb9d516c6d17b0619cf53dfba7cb7b29fe073e4 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Tue, 8 Oct 2019 15:23:46 -0700
Subject: [ruby/bigdecimal] Undef BigDecimal#initialize_copy

Both BigDecimal#clone and BigDecimal#dup return self, there is no
reason to have initialize_copy exposed as a Ruby method.

The same is true for initialize_clone and initialize_dup.

https://github.com/ruby/bigdecimal/commit/aaf237fa9e

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index c442335..23851ee 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -3451,7 +3451,9 @@ Init_bigdecimal(void) https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L3451
 
 
     /* instance methods */
-    rb_define_method(rb_cBigDecimal, "initialize_copy", BigDecimal_initialize_copy, 1);
+    rb_undef_method(rb_cBigDecimal, "initialize_copy");
+    rb_undef_method(rb_cBigDecimal, "initialize_clone");
+    rb_undef_method(rb_cBigDecimal, "initialize_dup");
     rb_define_method(rb_cBigDecimal, "precs", BigDecimal_prec, 0);
 
     rb_define_method(rb_cBigDecimal, "add", BigDecimal_add2, 2);
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 4598936..6928834 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -1876,6 +1876,12 @@ class TestBigDecimal < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/bigdecimal/test_bigdecimal.rb#L1876
     EOS
   end
 
+  def test_no_initialize_copy
+    assert_equal(false, BigDecimal(1).respond_to?(:initialize_copy, true))
+    assert_equal(false, BigDecimal(1).respond_to?(:initialize_dup, true))
+    assert_equal(false, BigDecimal(1).respond_to?(:initialize_clone, true))
+  end
+
   def assert_no_memory_leak(code, *rest, **opt)
     code = "8.times {20_000.times {begin #{code}; rescue NoMemoryError; end}; GC.start}"
     super(["-rbigdecimal"],
-- 
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