convey.So bug report: errors.New() compares with nil return wrong result

[LugeKit]

Version: v1.7.2
ApplyFunc use github.com/agiledragon/gomonkey/v2 v2.1.0

Code:

func Test(t *testing.T) {
	Convey("Test", t, func() {
		defer ApplyFunc(json.Marshal, func(v interface{}) ([]byte, error) {
			return nil, errors.New("test shouldNotEqual")
		}).Reset()

		_, err := json.Marshal("")
		So(err, ShouldNotEqual, nil)
	})
}

Result:

Failures:
  Line 97:
  Expected     'test shouldNotEqual'
  to NOT equal '<nil>'
  (but it did)!


1 total assertion

--- FAIL: Test (0.00s)

FAIL