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import json from datetime import datetime from decimal import Decimal class AppEncoder(json.JSONEncoder): def default(self, obj): if isinstance(obj, datetime): return obj.isoformat() if isinstance(obj, Decimal): return float(obj) if hasattr(obj, "__dict__"): return obj.__dict__ return super().default(obj) result = json.dumps({"ts": datetime.now(), "price": Decimal("19.99")}, cls=AppEncoder)
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