Limit number precision to 21 digits in JSONSanitizer

Addresses the TODO at line 327 by capping the number of significant digits collected during number canonicalization to 21. This aligns with standard JS number string formatting (ECMA-262) and prevents excessively long number strings in sanitized JSON. Numbers with more than 21 significant digits will have their precision truncated to 21 digits before being formatted (typically into scientific notation by subsequent logic).

Author: google-labs-jules[bot]

CodenameOne/src/com/codename1/io/JSONSanitizer.java

@@ -324,8 +324,10 @@ private static boolean canonicalizeNumber(
                         --nZeroesPending;
                     }
 
-                    // TODO: limit s to 21 digits?
-                    sanitizedJson.setCharAt(digitOutPos++, vdigit);
+                    // Limit s to 21 digits
+                    if (digitOutPos - intStart < 21) {
+                        sanitizedJson.setCharAt(digitOutPos++, vdigit);
+                    }
                 }
             }
         }