https://git.ruby-lang.org/ruby.git/commit/?id=05c4c88767

From 05c4c88767b54808cd1459a1d6da11179c422cfa Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Sun, 26 Jul 2020 18:32:36 +0900
Subject: merge revision(s) 1b4d406e3a04032b6d01e92b6d184a16945c6ac3: [Backport
 #16498] [Backport #16914]

	Hash#transform_values should return a plain new Hash

	[Bug #16498]

diff --git a/hash.c b/hash.c
index dd78d2d..4a3f2ff 100644
--- a/hash.c
+++ b/hash.c
@@ -1558,10 +1558,8 @@ rb_hash_new_with_size(st_index_t size) https://github.com/ruby/ruby/blob/trunk/hash.c#L1558
 }
 
 static VALUE
-hash_dup(VALUE hash, VALUE klass, VALUE flags)
+hash_copy(VALUE ret, VALUE hash)
 {
-    VALUE ret = hash_alloc_flags(klass, flags,
-				 RHASH_IFNONE(hash));
     if (!RHASH_EMPTY_P(hash)) {
         if (RHASH_AR_TABLE_P(hash))
             ar_copy(ret, hash);
@@ -1571,6 +1569,13 @@ hash_dup(VALUE hash, VALUE klass, VALUE flags) https://github.com/ruby/ruby/blob/trunk/hash.c#L1569
     return ret;
 }
 
+static VALUE
+hash_dup(VALUE hash, VALUE klass, VALUE flags)
+{
+    return hash_copy(hash_alloc_flags(klass, flags, RHASH_IFNONE(hash)),
+                     hash);
+}
+
 VALUE
 rb_hash_dup(VALUE hash)
 {
@@ -3205,7 +3210,7 @@ rb_hash_transform_values(VALUE hash) https://github.com/ruby/ruby/blob/trunk/hash.c#L3210
     VALUE result;
 
     RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
-    result = hash_dup(hash, rb_cHash, 0);
+    result = hash_copy(hash_alloc(rb_cHash), hash);
 
     if (!RHASH_EMPTY_P(hash)) {
         rb_hash_stlike_foreach_with_replace(result, transform_values_foreach_func, transform_values_foreach_replace, result);
diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 7832466..738b058 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1664,9 +1664,15 @@ class TestHash < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_hash.rb#L1664
 
   def test_transform_values
     x = @cls[a: 1, b: 2, c: 3]
+    x.default = 42
     y = x.transform_values {|v| v ** 2 }
     assert_equal([1, 4, 9], y.values_at(:a, :b, :c))
     assert_not_same(x, y)
+    assert_nil(y.default)
+
+    x.default_proc = proc {|h, k| k}
+    y = x.transform_values {|v| v ** 2 }
+    assert_nil(y.default_proc)
 
     y = x.transform_values.with_index {|v, i| "#{v}.#{i}" }
     assert_equal(%w(1.0  2.1  3.2), y.values_at(:a, :b, :c))
diff --git a/version.h b/version.h
index 04dd454..d2cfe49 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L2
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 1
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 114
+#define RUBY_PATCHLEVEL 115
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 7
-- 
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