snapshottest.sorted_dict.SortedDict only accepts string dict keys

snapshottest-enum.py

import enum
import collections
import snapshottest

class Fruit(enum.Enum):
    APPLE = 1
    ORANGE = 2


test_value = {
    Fruit.APPLE: 100,
    Fruit.ORANGE: 400,
}

# This works fine...
collections.OrderedDict(**test_value)

# But this throws:
# ```
# TypeError: __init__() keywords must be strings
# ```
snapshottest.sorted_dict.SortedDict(**test_value)

https://repl.it/repls/TiredQuerulousTrapezoids