):
    return {"file_size": len(p) if p else None}


@app.post(
    "/optional-uploadfile-validation-alias",
    operation_id="optional_uploadfile_validation_alias",
)
def read_optional_uploadfile_validation_alias(
    p: Annotated[Optional[UploadFile], File(validation_alias="p_val_alias")] = None,
):
    return {"file_size": p.size if p else None}