sbool isPersistableClass(Class c) {
  S name = c.getName();
  if (isSubtypeOf(c, TransientObject)) false;
  if (isAnonymousClassName(name)) false;
  if (isBoxedType(c)) true;
  if (isArrayType(c)) true;
  if (c == Class.class || c == S || c == File || c == Color.class) true;
  if (name.startsWith("java.util.Collections$Synchronized")) true;
  
  if (hasThisDollarFields(c))
    ret hasSingleArgumentConstructor(c);
  else
    ret getDefaultConstructor(c) != null;
}

Began life as a copy of #1031499