@SuppressWarnings("unchecked")
public FieldDiffs setDiff(
String field, @Nullable Serializable oldValue, @Nullable Serializable newValue) {
Diff diff = diffs.get(field);
if (diff == null) {
diff = new Diff(oldValue, newValue);
diffs.put(field, diff);
} else {
diff.setNewValue(newValue);
}
return this;
}
