chore: performance improvement on asStringSmall (#688)

Author: nigrosimone

lib/serializer.js

@@ -141,11 +141,8 @@ module.exports = class Serializer {
     // eslint-disable-next-line
     for (var i = 0; i < len; i++) {
       point = str.charCodeAt(i)
-      if (point < 32) {
-        return JSON.stringify(str)
-      }
-      if (point >= 0xD800 && point <= 0xDFFF) {
-        // The current character is a surrogate.
+      if (point < 32 || (point >= 0xD800 && point <= 0xDFFF)) {
+        // The current character is non-printable characters or a surrogate.
         return JSON.stringify(str)
       }
       if (