Omit Parallel execution of test case

.github/workflows/go.yml

@@ -20,8 +20,6 @@ jobs:
 
     - name: Test
       run: go test -v ./ -count=1
-      env:
-        GOGC: off
 
     - name: Test with GC
       run: go test -v ./ -count=1

encode_test.go

@@ -948,7 +948,7 @@ var badFloatREs = []*regexp.Regexp{
 }
 
 func TestMarshalFloat(t *testing.T) {
-	t.Parallel()
+	//t.Parallel()
 	nfail := 0
 	test := func(f float64, bits int) {
 		vf := interface{}(f)

json_test.go

@@ -136,7 +136,7 @@ func TestCompactBig(t *testing.T) {
 }
 
 func TestIndentBig(t *testing.T) {
-	t.Parallel()
+	//t.Parallel()
 	initBig()
 	var buf bytes.Buffer
 	if err := json.Indent(&buf, jsonBig, "", "\t"); err != nil {