Fix code3

Author: justdevw

src/core.js

@@ -388,11 +388,11 @@ export async function compress(input, options) {
             if (typeof JUSTCstr != 'undefined' && JUSTCstr.length < str.length && str == JSON.stringify(obj)) {                
                 str = JUSTCstr;
                 code3 = 1;
-            } else {
+            } else if (str.startsWith('{') && str.endsWith('}')) {
                 str = str.slice(1,-1);
                 code3 = 5;
             }
-        } else if (typeof obj == 'object' && Array.isArray(obj)) {
+        } else if (typeof obj == 'object' && Array.isArray(obj) && str.startsWith('[') && str.endsWith(']')) {
         /* JSON Array (as string) */
         str = str.slice(1,-1);
         code3 = 3;