fix: encode/decode proto pollution

Author: Moumouls

src/decode.ts

@@ -49,7 +49,9 @@ export default function decode(value: any): any {
   }
   const copy = {};
   for (const k in value) {
-    copy[k] = decode(value[k]);
+    if (Object.prototype.hasOwnProperty.call(value, k)) {
+      copy[k] = decode(value[k]);
+    }
   }
   return copy;
 }

src/encode.ts

@@ -71,7 +71,10 @@ function encode(
   if (value && typeof value === 'object') {
     const output = {};
     for (const k in value) {
-      output[k] = encode(value[k], disallowObjects, forcePointers, seen, offline);
+      // Only iterate over own properties
+      if (Object.prototype.hasOwnProperty.call(value, k)) {
+        output[k] = encode(value[k], disallowObjects, forcePointers, seen, offline);
+      }
     }
     return output;
   }