Update codec-bigint.test.ts

Changed the test to encode as number if its in SAFE_INTEGER Area.

Author: Kapsonfire

test/codec-bigint.test.ts

@@ -5,11 +5,15 @@ const extensionCodec = new ExtensionCodec();
 extensionCodec.register({
   type: 0,
   encode: (input: unknown) => {
-    if (typeof input === "bigint") {
-      return encode(input.toString());
-    } else {
-      return null;
-    }
+     if (typeof input === "bigint") {
+        if (input <= Number.MAX_SAFE_INTEGER && input >= Number.MIN_SAFE_INTEGER) {
+            return encode(parseInt(input.toString(), 10));
+        } else {
+            return encode(input.toString());
+        }
+     } else {
+        return null;
+     }
   },
   decode: (data: Uint8Array) => {
     return BigInt(decode(data));