diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 39922910..5fcde733 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Release History
 
+## v4.1.2 (2022-06-03)
+
+- fix #1331: use `str_eq` to assert string and digit equality
+
 ## v4.1.1 (2022-05-31)
+
 - fix: failed to build debugtalk.go without go.mod
 - fix: avoid to escape from html special characters like '&' in converted JSON testcase
 - fix: display the full step name when referencing testcase in html report
diff --git a/hrp/internal/builtin/assertion.go b/hrp/internal/builtin/assertion.go
index 96fd4310..20473727 100644
--- a/hrp/internal/builtin/assertion.go
+++ b/hrp/internal/builtin/assertion.go
@@ -45,6 +45,7 @@ var Assertions = map[string]func(t assert.TestingT, actual interface{}, expected
 	"contained_by":             ContainedBy,
 	"str_eq":                   StringEqual,
 	"string_equals":            StringEqual,
+	"equal_fold":               EqualFold,
 	"regex_match":              RegexMatch,
 }
 
@@ -157,6 +158,12 @@ func ContainedBy(t assert.TestingT, actual, expected interface{}, msgAndArgs ...
 }
 
 func StringEqual(t assert.TestingT, actual, expected interface{}, msgAndArgs ...interface{}) bool {
+	a := fmt.Sprintf("%v", actual)
+	e := fmt.Sprintf("%v", expected)
+	return assert.True(t, a == e, msgAndArgs)
+}
+
+func EqualFold(t assert.TestingT, actual, expected interface{}, msgAndArgs ...interface{}) bool {
 	if !assert.IsType(t, "string", actual, msgAndArgs) {
 		return false
 	}
diff --git a/hrp/internal/builtin/assertion_test.go b/hrp/internal/builtin/assertion_test.go
index aa7d4bde..3a2ebc89 100644
--- a/hrp/internal/builtin/assertion_test.go
+++ b/hrp/internal/builtin/assertion_test.go
@@ -158,6 +158,27 @@ func TestContainedBy(t *testing.T) {
 }
 
 func TestStringEqual(t *testing.T) {
+	testData := []struct {
+		raw      interface{}
+		expected interface{}
+	}{
+		{"abcd", "abcd"},
+		{"0", 0},
+		{"123", 123},
+		// {"123.0", 123.0}, // FIXME
+		{"12.3", 12.3},
+		{"-12.3", -12.3},
+		{"-123", -123},
+	}
+
+	for _, data := range testData {
+		if !assert.True(t, StringEqual(t, data.raw, data.expected)) {
+			t.Fatal()
+		}
+	}
+}
+
+func TestEqualFold(t *testing.T) {
 	testData := []struct {
 		raw      interface{}
 		expected interface{}
@@ -168,7 +189,7 @@ func TestStringEqual(t *testing.T) {
 	}
 
 	for _, data := range testData {
-		if !assert.True(t, StringEqual(t, data.raw, data.expected)) {
+		if !assert.True(t, EqualFold(t, data.raw, data.expected)) {
 			t.Fatal()
 		}
 	}
diff --git a/hrp/step_request.go b/hrp/step_request.go
index 28b174ce..f890a93e 100644
--- a/hrp/step_request.go
+++ b/hrp/step_request.go
@@ -1065,6 +1065,17 @@ func (s *StepRequestValidation) AssertStringEqual(jmesPath string, expected inte
 	return s
 }
 
+func (s *StepRequestValidation) AssertEqualFold(jmesPath string, expected interface{}, msg string) *StepRequestValidation {
+	v := Validator{
+		Check:   jmesPath,
+		Assert:  "equal_fold",
+		Expect:  expected,
+		Message: msg,
+	}
+	s.step.Validators = append(s.step.Validators, v)
+	return s
+}
+
 func (s *StepRequestValidation) AssertLengthLessOrEquals(jmesPath string, expected interface{}, msg string) *StepRequestValidation {
 	v := Validator{
 		Check:   jmesPath,
diff --git a/hrp/tests/function_test.go b/hrp/tests/function_test.go
index c6acc493..a4cc5d01 100644
--- a/hrp/tests/function_test.go
+++ b/hrp/tests/function_test.go
@@ -28,7 +28,7 @@ func TestCaseCallFunction(t *testing.T) {
 				AssertLengthEqual("body.args.foo1", 5, "check args foo1").
 				AssertEqual("body.args.foo2", "12.3", "check args foo2").
 				AssertTypeMatch("body.args.foo3", "str", "check args foo3 is type string").
-				AssertStringEqual("body.args.foo3", "foo3", "check args foo3 case-insensitivity").
+				AssertEqualFold("body.args.foo3", "foo3", "check args foo3 case-insensitivity").
 				AssertContains("body.args.foo3", "Foo", "check contains ").
 				AssertContainedBy("body.args.foo3", "this is Foo3 test", "check contained by"), // notice: request params value will be converted to string
 			hrp.NewStep("post json data with functions").