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Changing _check_value from:
 def _check_value(self, action, value):
 # converted value must be one of the choices (if specified)
 if action.choices is not None and value not in action.choices:
 ...
to
 def _check_value(self, action, value):
 # converted value must be one of the choices (if specified)
 if action.choices is not None:
 choices = action.choices
 if isinstance(choices, str):
 choices = list(choices)
 if value not in action.choices:
 ...
would correct the string search without affecting other types of choices.