@@ -256,14 +256,15 @@ def model_dump(
256256 mode : Literal ["json" , "python" ] | str = "python" ,
257257 include : IncEx | None = None ,
258258 exclude : IncEx | None = None ,
259- by_alias : bool = False ,
259+ by_alias : bool | None = None ,
260260 exclude_unset : bool = False ,
261261 exclude_defaults : bool = False ,
262262 exclude_none : bool = False ,
263263 round_trip : bool = False ,
264264 warnings : bool | Literal ["none" , "warn" , "error" ] = True ,
265265 context : dict [str , Any ] | None = None ,
266266 serialize_as_any : bool = False ,
267+ fallback : Callable [[Any ], Any ] | None = None ,
267268 ) -> dict [str , Any ]:
268269 """Usage docs: https://docs.pydantic.dev/2.4/concepts/serialization/#modelmodel_dump
269270
@@ -295,10 +296,12 @@ def model_dump(
295296 raise ValueError ("context is only supported in Pydantic v2" )
296297 if serialize_as_any != False :
297298 raise ValueError ("serialize_as_any is only supported in Pydantic v2" )
299+ if fallback is not None :
300+ raise ValueError ("fallback is only supported in Pydantic v2" )
298301 dumped = super ().dict ( # pyright: ignore[reportDeprecated]
299302 include = include ,
300303 exclude = exclude ,
301- by_alias = by_alias ,
304+ by_alias = by_alias if by_alias is not None else False ,
302305 exclude_unset = exclude_unset ,
303306 exclude_defaults = exclude_defaults ,
304307 exclude_none = exclude_none ,
@@ -313,13 +316,14 @@ def model_dump_json(
313316 indent : int | None = None ,
314317 include : IncEx | None = None ,
315318 exclude : IncEx | None = None ,
316- by_alias : bool = False ,
319+ by_alias : bool | None = None ,
317320 exclude_unset : bool = False ,
318321 exclude_defaults : bool = False ,
319322 exclude_none : bool = False ,
320323 round_trip : bool = False ,
321324 warnings : bool | Literal ["none" , "warn" , "error" ] = True ,
322325 context : dict [str , Any ] | None = None ,
326+ fallback : Callable [[Any ], Any ] | None = None ,
323327 serialize_as_any : bool = False ,
324328 ) -> str :
325329 """Usage docs: https://docs.pydantic.dev/2.4/concepts/serialization/#modelmodel_dump_json
@@ -348,11 +352,13 @@ def model_dump_json(
348352 raise ValueError ("context is only supported in Pydantic v2" )
349353 if serialize_as_any != False :
350354 raise ValueError ("serialize_as_any is only supported in Pydantic v2" )
355+ if fallback is not None :
356+ raise ValueError ("fallback is only supported in Pydantic v2" )
351357 return super ().json ( # type: ignore[reportDeprecated]
352358 indent = indent ,
353359 include = include ,
354360 exclude = exclude ,
355- by_alias = by_alias ,
361+ by_alias = by_alias if by_alias is not None else False ,
356362 exclude_unset = exclude_unset ,
357363 exclude_defaults = exclude_defaults ,
358364 exclude_none = exclude_none ,
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