diff --git a/ChangeLog b/ChangeLog
index 641a0fad32..8757e8bce7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,15 +1,3 @@
-Wed Aug 25 18:31:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (rb_random_real): check the range of result.
-
-	* array.c (rb_ary_{shuffle_bang,sample}): use Random class object.
-
-	* random.c (try_get_rnd): use default_rand for Random as same as
-	  singleton methods.
-
-	* array.c (rb_ary_sample): use frozen shared array to get rid of
-	  reallocation.
-
 Wed Aug 25 03:42:43 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/dl/cfunc.c (rb_dlcfunc_call): workaround for VC9 for x64.
diff --git a/array.c b/array.c
index 9e15e9aa58..172a653aa2 100644
--- a/array.c
+++ b/array.c
@@ -3748,7 +3748,7 @@ static VALUE sym_random;
 static VALUE
 rb_ary_shuffle_bang(int argc, VALUE *argv, VALUE ary)
 {
-    VALUE *ptr, opts, randgen = rb_cRandom;
+    VALUE *ptr, opts, randgen = Qnil;
     long i = RARRAY_LEN(ary);
 
     if (OPTHASH_GIVEN_P(opts)) {
@@ -3811,7 +3811,7 @@ static VALUE
 rb_ary_sample(int argc, VALUE *argv, VALUE ary)
 {
     VALUE nv, result, *ptr;
-    VALUE opts, randgen = rb_cRandom;
+    VALUE opts, randgen = Qnil;
     long n, len, i, j, k, idx[10];
 
     len = RARRAY_LEN(ary);
@@ -3826,7 +3826,6 @@ rb_ary_sample(int argc, VALUE *argv, VALUE ary)
     rb_scan_args(argc, argv, "1", &nv);
     n = NUM2LONG(nv);
     if (n < 0) rb_raise(rb_eArgError, "negative sample number");
-    RB_GC_GUARD(ary) = ary_make_shared(ary);
     ptr = RARRAY_PTR(ary);
     len = RARRAY_LEN(ary);
     if (n > len) n = len;
@@ -3873,6 +3872,7 @@ rb_ary_sample(int argc, VALUE *argv, VALUE ary)
 	VALUE *ptr_result;
 	result = rb_ary_new4(len, ptr);
 	ptr_result = RARRAY_PTR(result);
+	RB_GC_GUARD(ary);
 	for (i=0; i<n; i++) {
 	    j = RAND_UPTO(len-i) + i;
 	    nv = ptr_result[j];
diff --git a/random.c b/random.c
index 25c9dea1ff..a89fcb8ee9 100644
--- a/random.c
+++ b/random.c
@@ -229,20 +229,15 @@ static rb_random_t default_rand;
 static VALUE rand_init(struct MT *mt, VALUE vseed);
 static VALUE random_seed(void);
 
-static rb_random_t *
-rand_start(rb_random_t *r)
+static struct MT *
+default_mt(void)
 {
+    rb_random_t *r = &default_rand;
     struct MT *mt = &r->mt;
     if (!genrand_initialized(mt)) {
 	r->seed = rand_init(mt, random_seed());
     }
-    return r;
-}
-
-static struct MT *
-default_mt(void)
-{
-    return &rand_start(&default_rand)->mt;
+    return mt;
 }
 
 unsigned int
@@ -368,9 +363,6 @@ get_rnd(VALUE obj)
 static rb_random_t *
 try_get_rnd(VALUE obj)
 {
-    if (obj == rb_cRandom) {
-	return rand_start(&default_rand);
-    }
     if (!rb_typeddata_is_kind_of(obj, &random_data_type)) return NULL;
     return DATA_PTR(obj);
 }
@@ -887,13 +879,7 @@ rb_random_int32(VALUE obj)
 {
     rb_random_t *rnd = try_get_rnd(obj);
     if (!rnd) {
-#if SIZEOF_LONG * CHAR_BIT > 32
-	VALUE lim = ULONG2NUM(0x100000000);
-#elif defined HAVE_LONG_LONG
-	VALUE lim = ULL2NUM((LONG_LONG)0xffffffff+1);
-#else
-	VALUE lim = rb_big_plus(ULONG2NUM(0xffffffff), INT2FIX(1));
-#endif
+	VALUE lim = ULONG2NUM(0xffffffff);
 	return NUM2ULONG(rb_funcall2(obj, id_rand, 1, &lim));
     }
     return genrand_int32(&rnd->mt);
@@ -905,11 +891,7 @@ rb_random_real(VALUE obj)
     rb_random_t *rnd = try_get_rnd(obj);
     if (!rnd) {
 	VALUE v = rb_funcall2(obj, id_rand, 0, 0);
-	double d = NUM2DBL(v);
-	if (d < 0.0 || d >= 1.0) {
-	    rb_raise(rb_eRangeError, "random number too big %g", d);
-	}
-	return d;
+	return NUM2DBL(v);
     }
     return genrand_real(&rnd->mt);
 }
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 4a8b700c77..f95d8870a1 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1899,19 +1899,6 @@ class TestArray < Test::Unit::TestCase
     end
   end
 
-  def test_shuffle_random
-    cc = nil
-    gen = proc do
-      10000000
-    end
-    class << gen
-      alias rand call
-    end
-    assert_raise(RangeError) {
-      [*0..2].shuffle(random: gen)
-    }
-  end
-
   def test_sample
     100.times do
       assert([0, 1, 2].include?([2, 1, 0].sample))