fix(pkg/strvals): use rune literal instead of ASCII

When checking that a value begins with zero use a rune literal instead of the
ASCII code for zero.

pkg/strvals/parser.go

@@ -309,7 +309,7 @@ func typedVal(v []rune) interface{} {
 	}
 
 	// If this value does not start with zero, try parsing it to an int
-	if len(val) != 0 && val[0] != 48 {
+	if len(val) != 0 && val[0] != '0' {
 		if iv, err := strconv.ParseInt(val, 10, 64); err == nil {
 			return iv
 		}