fix: revert magic number

Author: nigrosimone

lib/serializer.js

@@ -2,7 +2,6 @@
 
 // eslint-disable-next-line
 const STR_ESCAPE = /[\u0000-\u001f\u0022\u005c\ud800-\udfff]/
-const MAGIC_NUMBER = 42
 
 module.exports = class Serializer {
   constructor (options) {
@@ -93,7 +92,7 @@ module.exports = class Serializer {
 
   asString (str) {
     const len = str.length
-    if (len < MAGIC_NUMBER) {
+    if (len < 42) {
       // magically escape strings for json
       // relying on their charCodeAt
       // everything below 32 needs JSON.stringify()