fix(pkg/strvals): preserve leading zeros in vals

When passing values with "helm install --set" values with leading zeros are
preserved and not parsed as ints.

Closes #2693

pkg/strvals/parser.go

@@ -308,9 +308,12 @@ func typedVal(v []rune) interface{} {
 		return false
 	}
 
+	// If this value does not start with zero, try parsing it to an int
+	if len(val) != 0 && val[0] != 48 {
 		if iv, err := strconv.ParseInt(val, 10, 64); err == nil {
 			return iv
 		}
+	}
 
 	return val
 }

pkg/strvals/parser_test.go

@@ -93,6 +93,10 @@ func TestParseSet(t *testing.T) {
 			str:    "name1=,name2=value2",
 			expect: map[string]interface{}{"name1": "", "name2": "value2"},
 		},
+		{
+			str:    "leading_zeros=00009",
+			expect: map[string]interface{}{"leading_zeros": "00009"},
+		},
 		{
 			str: "name1,name2=",
 			err: true,