`serialization` logic not recognized in `json` and `python` schemas at lower levels

[sydney-runkle]

See pydantic/pydantic#9240 (comment) for more details

[sydney-runkle]

cc @davidhewitt, can we chat about this tomorrow? Also seems relevant for lax_or_strict and other schemas like that

[sydney-runkle]

See pydantic/pydantic#10049 (comment)