[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

1 files changed, 6 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 4598936b9a..6928834907 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -1876,6 +1876,12 @@ class TestBigDecimal < Test::Unit::TestCase
     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"],