numeric.c: Numeric#clone and #dup

* numeric.c (num_clone, num_dup): no longer raises TypeError,
  returns the receiver instead as well as Integer and Float.
  [ruby-core:79636] [Bug #13237]

* object.c (rb_immutable_obj_clone): immutable object clone with
  freeze optional keyword argument.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57682 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -1363,6 +1363,7 @@ VALUE rb_class_search_ancestor(VALUE klass, VALUE super);
 NORETURN(void rb_undefined_alloc(VALUE klass));
 double rb_num_to_dbl(VALUE val);
 VALUE rb_obj_dig(int argc, VALUE *argv, VALUE self, VALUE notfound);
+VALUE rb_immutable_obj_clone(int, VALUE *, VALUE);
 
 struct RBasicRaw {
     VALUE flags;

numeric.c

@@ -552,18 +552,38 @@ num_sadded(VALUE x, VALUE name)
     UNREACHABLE;
 }
 
+#if 0
 /*
- * Numerics are immutable values, which should not be copied.
+ *  call-seq:
+ *     num.clone(freeze: true) -> num
  *
- * Any attempt to use this method on a Numeric will raise a TypeError.
+ *  Returns the receiver.
+ *  _freeze_ cannot be +false+.
  */
 static VALUE
-num_init_copy(VALUE x, VALUE y)
+num_clone(int argc, VALUE *argv, VALUE x)
 {
-    rb_raise(rb_eTypeError, "can't copy %"PRIsVALUE, rb_obj_class(x));
-
-    UNREACHABLE;
+    return rb_immutable_obj_clone(argc, argv, x);
 }
+#else
+# define num_clone rb_immutable_obj_clone
+#endif
+
+#if 0
+/*
+ *  call-seq:
+ *     num.dup -> num
+ *
+ *  Returns the receiver.
+ */
+static VALUE
+num_dup(VALUE x)
+{
+    return x;
+}
+#else
+# define num_dup num_uplus
+#endif
 
 /*
  *  call-seq:
@@ -5222,8 +5242,9 @@ Init_Numeric(void)
 
     rb_define_method(rb_cNumeric, "singleton_method_added", num_sadded, 1);
     rb_include_module(rb_cNumeric, rb_mComparable);
-    rb_define_method(rb_cNumeric, "initialize_copy", num_init_copy, 1);
     rb_define_method(rb_cNumeric, "coerce", num_coerce, 1);
+    rb_define_method(rb_cNumeric, "clone", num_clone, -1);
+    rb_define_method(rb_cNumeric, "dup", num_dup, 0);
 
     rb_define_method(rb_cNumeric, "i", num_imaginary, 0);
     rb_define_method(rb_cNumeric, "+@", num_uplus, 0);

object.c

@@ -309,6 +309,9 @@ special_object_p(VALUE obj)
       case T_BIGNUM:
       case T_FLOAT:
       case T_SYMBOL:
+      case T_RATIONAL:
+      case T_COMPLEX:
+	/* not a comprehensive list */
 	return TRUE;
       default:
 	return FALSE;
@@ -349,6 +352,13 @@ rb_obj_clone2(int argc, VALUE *argv, VALUE obj)
     return immutable_obj_clone(obj, kwfreeze);
 }
 
+VALUE
+rb_immutable_obj_clone(int argc, VALUE *argv, VALUE obj)
+{
+    int kwfreeze = freeze_opt(argc, argv);
+    return immutable_obj_clone(obj, kwfreeze);
+}
+
 static int
 freeze_opt(int argc, VALUE *argv)
 {

test/ruby/test_numeric.rb

@@ -76,12 +76,18 @@ class TestNumeric < Test::Unit::TestCase
 
   def test_dup
     a = Numeric.new
-    assert_raise(TypeError) { a.dup }
+    assert_same a, a.dup
+  end
 
-    c = Module.new do
-      break eval("class C\u{3042} < Numeric; self; end")
+  def test_clone
+    a = Numeric.new
+    assert_same a, a.clone
+    assert_raise(ArgumentError) {a.clone(freeze: false)}
+
+    c = EnvUtil.labeled_class("\u{1f4a9}", Numeric)
+    assert_raise_with_message(ArgumentError, /\u{1f4a9}/) do
+      c.new.clone(freeze: false)
     end
-    assert_raise_with_message(TypeError, /C\u3042/) {c.new.dup}
   end
 
   def test_quo