`deal` element in /v2/classifieds/listings/batch

[StrangePlay02]

Hello good sir,

I noticed occasionally backpacktf endpoint /v2/classifieds/listings/batch returns a new element deal.

response[1]['result'].keys()
dict_keys(['id', 'steamid', 'appid', 'currencies', 'value', 'tradeOffersPreferred', 'buyoutOnly', 'details', 'listedAt', 'bumpedAt', 'intent', 'count', 'status', 'source', 'item', 'deal', 'userAgent', 'user'])

Looks like this:

response[1]['result']['deal']
{'percent': 0.11452184179456913, 'value': 33.88}

This is however not accounted for in the Listing dataclass, leading to a KeyError:

class Listing:
    id: str
    steamid: str
    appid: int
    currencies: dict[str, Any]
    value: dict
    details: str
    listedAt: int
    bumpedAt: int
    intent: str
    count: int
    status: str
    source: str
    item: dict[str, Any]
    user: dict = field(default_factory=dict)  # Made optional for API compatibility
    userAgent: dict = field(default_factory=dict)
    tradeOffersPreferred: bool = None
    buyoutOnly: bool = None
    archived: bool = field(default=False)  # Added for API compatibility

This breaks create_listings():

    def create_listings(self, listings: list[dict]) -> list[Listing]:
        to_list = [construct_listing(**listing) for listing in listings]
        response = self.request("POST", "/v2/classifieds/listings/batch", json=to_list)
        return [Listing(**listing["result"]) for listing in response]

Hope this can be looked at. Thanks so much!