diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/deepcopy.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/deepcopy.go
index dd9680c36f5..37b4d1df9fe 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/deepcopy.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/deepcopy.go
@@ -16,6 +16,8 @@ limitations under the License.
 
 package apiextensions
 
+import "k8s.io/apimachinery/pkg/runtime"
+
 // TODO: Update this after a tag is created for interface fields in DeepCopy
 func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 	if in == nil {
@@ -26,14 +28,14 @@ func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 	*out = *in
 
 	if in.Default != nil {
-		defaultJSON := JSON(deepCopyJSON(*(in.Default)))
+		defaultJSON := JSON(runtime.DeepCopyJSONValue(*(in.Default)))
 		out.Default = &(defaultJSON)
 	} else {
 		out.Default = nil
 	}
 
 	if in.Example != nil {
-		exampleJSON := JSON(deepCopyJSON(*(in.Example)))
+		exampleJSON := JSON(runtime.DeepCopyJSONValue(*(in.Example)))
 		out.Example = &(exampleJSON)
 	} else {
 		out.Example = nil
@@ -121,7 +123,7 @@ func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 	if in.Enum != nil {
 		out.Enum = make([]JSON, len(in.Enum))
 		for i := range in.Enum {
-			out.Enum[i] = deepCopyJSON(in.Enum[i])
+			out.Enum[i] = runtime.DeepCopyJSONValue(in.Enum[i])
 		}
 	}
 
@@ -258,22 +260,3 @@ func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 
 	return out
 }
-
-func deepCopyJSON(x interface{}) interface{} {
-	switch x := x.(type) {
-	case map[string]interface{}:
-		clone := make(map[string]interface{}, len(x))
-		for k, v := range x {
-			clone[k] = deepCopyJSON(v)
-		}
-		return clone
-	case []interface{}:
-		clone := make([]interface{}, len(x))
-		for i := range x {
-			clone[i] = deepCopyJSON(x[i])
-		}
-		return clone
-	default:
-		return x
-	}
-}
diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/deepcopy.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/deepcopy.go
index 903773ae213..f6a114e2b39 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/deepcopy.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/deepcopy.go
@@ -236,22 +236,3 @@ func (in *JSONSchemaProps) DeepCopy() *JSONSchemaProps {
 
 	return out
 }
-
-func deepCopyJSON(x interface{}) interface{} {
-	switch x := x.(type) {
-	case map[string]interface{}:
-		clone := make(map[string]interface{}, len(x))
-		for k, v := range x {
-			clone[k] = deepCopyJSON(v)
-		}
-		return clone
-	case []interface{}:
-		clone := make([]interface{}, len(x))
-		for i := range x {
-			clone[i] = deepCopyJSON(x[i])
-		}
-		return clone
-	default:
-		return x
-	}
-}
diff --git a/staging/src/k8s.io/apimachinery/pkg/apis/meta/fuzzer/fuzzer.go b/staging/src/k8s.io/apimachinery/pkg/apis/meta/fuzzer/fuzzer.go
index 54fab9c02ea..3d49a5d5cf4 100644
--- a/staging/src/k8s.io/apimachinery/pkg/apis/meta/fuzzer/fuzzer.go
+++ b/staging/src/k8s.io/apimachinery/pkg/apis/meta/fuzzer/fuzzer.go
@@ -268,7 +268,7 @@ func v1alpha1FuzzerFuncs(codecs runtimeserializer.CodecFactory) []interface{} {
 				case 0:
 					r.Cells[i] = c.RandString()
 				case 1:
-					r.Cells[i] = c.Uint64()
+					r.Cells[i] = c.Int63()
 				case 2:
 					r.Cells[i] = c.RandBool()
 				case 3:
@@ -280,7 +280,7 @@ func v1alpha1FuzzerFuncs(codecs runtimeserializer.CodecFactory) []interface{} {
 				case 4:
 					x := make([]interface{}, c.Intn(10))
 					for i := range x {
-						x[i] = c.Uint64()
+						x[i] = c.Int63()
 					}
 					r.Cells[i] = x
 				default:
diff --git a/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1beta1/deepcopy.go b/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1beta1/deepcopy.go
index 2dd440bb729..3b2bedd9233 100644
--- a/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1beta1/deepcopy.go
+++ b/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1beta1/deepcopy.go
@@ -16,6 +16,8 @@ limitations under the License.
 
 package v1beta1
 
+import "k8s.io/apimachinery/pkg/runtime"
+
 func (in *TableRow) DeepCopy() *TableRow {
 	if in == nil {
 		return nil
@@ -26,7 +28,7 @@ func (in *TableRow) DeepCopy() *TableRow {
 	if in.Cells != nil {
 		out.Cells = make([]interface{}, len(in.Cells))
 		for i := range in.Cells {
-			out.Cells[i] = deepCopyJSON(in.Cells[i])
+			out.Cells[i] = runtime.DeepCopyJSONValue(in.Cells[i])
 		}
 	}
 
@@ -40,22 +42,3 @@ func (in *TableRow) DeepCopy() *TableRow {
 	in.Object.DeepCopyInto(&out.Object)
 	return out
 }
-
-func deepCopyJSON(x interface{}) interface{} {
-	switch x := x.(type) {
-	case map[string]interface{}:
-		clone := make(map[string]interface{}, len(x))
-		for k, v := range x {
-			clone[k] = deepCopyJSON(v)
-		}
-		return clone
-	case []interface{}:
-		clone := make([]interface{}, len(x))
-		for i := range x {
-			clone[i] = deepCopyJSON(x[i])
-		}
-		return clone
-	default:
-		return x
-	}
-}
diff --git a/staging/src/k8s.io/apimachinery/pkg/runtime/converter.go b/staging/src/k8s.io/apimachinery/pkg/runtime/converter.go
index 91920535d36..291d7a4e888 100644
--- a/staging/src/k8s.io/apimachinery/pkg/runtime/converter.go
+++ b/staging/src/k8s.io/apimachinery/pkg/runtime/converter.go
@@ -73,7 +73,6 @@ var (
 	mapStringInterfaceType = reflect.TypeOf(map[string]interface{}{})
 	stringType             = reflect.TypeOf(string(""))
 	int64Type              = reflect.TypeOf(int64(0))
-	uint64Type             = reflect.TypeOf(uint64(0))
 	float64Type            = reflect.TypeOf(float64(0))
 	boolType               = reflect.TypeOf(bool(false))
 	fieldCache             = newFieldsCache()
@@ -438,13 +437,15 @@ func (c *unstructuredConverter) ToUnstructured(obj interface{}) (map[string]inte
 }
 
 // DeepCopyJSON deep copies the passed value, assuming it is a valid JSON representation i.e. only contains
-// types produced by json.Unmarshal().
+// types produced by json.Unmarshal() and also int64.
+// bool, int64, float64, string, []interface{}, map[string]interface{}, json.Number and nil
 func DeepCopyJSON(x map[string]interface{}) map[string]interface{} {
 	return DeepCopyJSONValue(x).(map[string]interface{})
 }
 
 // DeepCopyJSONValue deep copies the passed value, assuming it is a valid JSON representation i.e. only contains
-// types produced by json.Unmarshal().
+// types produced by json.Unmarshal() and also int64.
+// bool, int64, float64, string, []interface{}, map[string]interface{}, json.Number and nil
 func DeepCopyJSONValue(x interface{}) interface{} {
 	switch x := x.(type) {
 	case map[string]interface{}:
@@ -591,10 +592,14 @@ func toUnstructured(sv, dv reflect.Value) error {
 		dv.Set(reflect.ValueOf(sv.Int()))
 		return nil
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		if dt.Kind() == reflect.Interface && dv.NumMethod() == 0 {
-			dv.Set(reflect.New(uint64Type))
+		uVal := sv.Uint()
+		if uVal > math.MaxInt64 {
+			return fmt.Errorf("unsigned value %d does not fit into int64 (overflow)", uVal)
 		}
-		dv.Set(reflect.ValueOf(sv.Uint()))
+		if dt.Kind() == reflect.Interface && dv.NumMethod() == 0 {
+			dv.Set(reflect.New(int64Type))
+		}
+		dv.Set(reflect.ValueOf(int64(uVal)))
 		return nil
 	case reflect.Float32, reflect.Float64:
 		if dt.Kind() == reflect.Interface && dv.NumMethod() == 0 {
diff --git a/staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json/json.go b/staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json/json.go
index 2b795b5b84f..f7738d116cd 100644
--- a/staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json/json.go
+++ b/staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json/json.go
@@ -75,11 +75,6 @@ func init() {
 		case jsoniter.NumberValue:
 			var number json.Number
 			iter.ReadVal(&number)
-			u64, err := strconv.ParseUint(string(number), 10, 64)
-			if err == nil {
-				*(*interface{})(ptr) = u64
-				return
-			}
 			i64, err := strconv.ParseInt(string(number), 10, 64)
 			if err == nil {
 				*(*interface{})(ptr) = i64