Can't reference IntEnum state with value 0 in transition destination

I defined an IntEnum that I'm using as the states. It has a member with value 0. When defining the transitions, I can't use that member as a destination. I can, however, get it to work by using a string of the enumeration name.

Minimal example:

from enum import IntEnum
from transitions import Machine

class State(IntEnum):
    FOO = 0
    BAR = 1

transitions = [
    ['foo', State.FOO, State.BAR],
    ['bar', State.BAR, State.FOO],
    # ['bar', State.BAR, 'FOO'],
]

class StateMachine(Machine):
    def __init__(self):
        super().__init__(states=State, initial=State.FOO, transitions=transitions)

m = StateMachine()
m.foo()
assert m.is_BAR()
m.bar()
assert m.is_FOO()  # raises AssertionError

Making any one (or more) of the following changes causes it to work fine and not raise an AssertionError:

Switching the 'bar' transition to the commented-out one
Changing the value of State.FOO to anything other than 0
Changing from IntEnum to Enum

I setup logging to the console to see what was going on. I noticed the following message: DEBUG:transitions.core:Initiating transition from state BAR to state None...

pytransitions / transitions

Can't reference IntEnum state with value 0 in transition destination #440

Minimal example: