message: Tree: remove duplicated assignment
  ## Description
  Fix bug in . Old version of the assignment was accidently left in
  one spot after restoring it to do performance comparison.
diff: @@ -118,7 +118,6 @@ export function cursorToJsonObject(reader: ITreeCursor): JsonCompatible {
  mapCursorFields(reader, (cursor) => {
  const key = cursor.getFieldKey() as LocalFieldKey;
  assert(cursor.firstNode(), 0x420 /* expected non-empty field */);
  - result[key] = cursorToJsonObject(reader);
  // like `result[key] = cursorToJsonObject(reader);` except safe when keyString == "__proto__".
  Object.defineProperty(result, key, {
  enumerable: true,
  