set() not serializable after upgrade to 2.0.0

[Lendemor]

An error occur when serializing set() with ujson > 2.0.0

Exemple :

Expected :

In [4]: ujson.dumps(set([1,2]))                                                               
Out[4]: '[1,2]'

Obtained :

In [31]: ujson.dumps(set([1,2]))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-31-38b9a6ab1088> in <module>
----> 1 ujson.dumps(set([1,2]))

TypeError: ��
�� is not JSON serializable

Test realized with python3.7

[hugovk]

Thanks for the report. This is intentional, please see #374. (I'll pin that too.)