def filter_by_currency_since_limit(self, array, code=None, since=None, limit=None):
    return self.filter_by_value_since_limit(array, 'currency', code, since, limit)
def filter_by_currency_since_limit(self, array, code=None, since=None, limit=None):
    return self.filter_by_value_since_limit(array, 'currency', code, since, limit)