Cython Packer requires datetime tzinfo, Python fallback does not #435

import msgpack
from msgpack.fallback import Packer
import datetime

dt = datetime.datetime(2020, 7, 24, 0, 37, 28, 190432,
                       tzinfo=datetime.timezone.utc)

packed = Packer(datetime=True).pack(dt)
print(msgpack.unpackb(packed, timestamp=3))

packed = msgpack.Packer(datetime=True).pack(dt)
print(msgpack.unpackb(packed, timestamp=3))

import msgpack
from msgpack.fallback import Packer
import datetime

dt = datetime.datetime(2020, 7, 24, 0, 37, 28, 190432)

packed = Packer(datetime=True).pack(dt)
print(msgpack.unpackb(packed, timestamp=3))

packed = msgpack.Packer(datetime=True).pack(dt)
print(msgpack.unpackb(packed, timestamp=3))

2020-07-24 07:37:28.190432+00:00
Traceback (most recent call last):
  File "test_msgpack.py", line 10, in <module>
    packed = msgpack.Packer(datetime=True).pack(dt)
  File "msgpack/_packer.pyx", line 286, in msgpack._cmsgpack.Packer.pack
  File "msgpack/_packer.pyx", line 292, in msgpack._cmsgpack.Packer.pack
  File "msgpack/_packer.pyx", line 289, in msgpack._cmsgpack.Packer.pack
  File "msgpack/_packer.pyx", line 283, in msgpack._cmsgpack.Packer._pack
TypeError: can not serialize 'datetime.datetime' object