Handling more cases

class BoolSetting(Setting):

class BoolSetting(Setting):

    """Setting of a value that has to be either ON or OFF"""

    """Setting of a value that has to be either ON or OFF"""

    def parse(self, data):

    def parse(self, data):

        if data in ('1', 'true'):

        if data in ('1', 'true', 'True'):

            data = True

            data = True

        if data in ('0', '', 'false'):

        if data in ('0', '', 'false', 'False'):

            data = False

            data = False

        if not isinstance(data, bool):

        if not isinstance(data, bool):