Mongoengine-serialize

refactor and enhancement in list type and dict type in parent and child attribute
fix exclude function fixes on nested attribute will be excluded

remove Exception error and have an alternative value if alter_after_serialize_attributes is not complied properly

before only accepts BaseDocument. not you can directly feed your find() result object to the serialize library

further explanation on how you can have more than 1 tier of child collection using alter_after_serialize_attributes