nullable=True is not propagated to the generated schema

[jerivas]

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Example Code

from sqlmodel import Field, SQLModel
from pydantic import Field as PydanticField

class Demo(SQLModel):
    field1: str | None = Field(nullable=True)
    field2: str | None = PydanticField(nullable=True)

Demo.schema()

{'title': 'Demo',
 'type': 'object',
 'properties': {
  'field1': {'title': 'Field1', 'type': 'string'},
  'field2': {'title': 'Field2', 'nullable': True, 'type': 'string'}
}}

Description

• Pass nullable=True to a SQLModel Field
• Expect the generated schema to include "nullable": true, but it's missing
• For comparison, Pydantic's Field class generates "nullable": true as expected

Operating System

Linux

Operating System Details

No response

SQLModel Version

0.0.8

Python Version

3.10.12

Additional Context

No response